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data-page-key="/UserGuide/V1.2.x/Reference/Status-Codes.html">...</span></span><span class="page-reading-time-info" aria-label="Reading Time"><svg xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>About 4 min</span><meta property="timeRequired" content="PT4M"></span><!----><!----></div><hr></div><!----><!--[--><!----><!--]--><div class="theme-hope-content"><h1 id="status-codes" tabindex="-1"><a class="header-anchor" href="#status-codes"><span>Status Codes</span></a></h1><p>A sample solution as IoTDB requires registering the time series first before writing data is:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>try {
    writeData();
} catch (SQLException e) {
  // the most case is that the time series does not exist
  if (e.getMessage().contains(&quot;exist&quot;)) {
      //However, using the content of the error message is not so efficient
      registerTimeSeries();
      //write data once again
      writeData();
  }
}

</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>With Status Code, instead of writing codes like <code>if (e.getErrorMessage().contains(&quot;exist&quot;))</code>, we can simply use <code>e.getErrorCode() == TSStatusCode.TIME_SERIES_NOT_EXIST_ERROR.getStatusCode()</code>.</p><p>Here is a list of Status Code and related message:</p><table><thead><tr><th style="text-align:left;">Status Code</th><th style="text-align:left;">Status Type</th><th style="text-align:left;">Meanings</th></tr></thead><tbody><tr><td style="text-align:left;">200</td><td style="text-align:left;">SUCCESS_STATUS</td><td style="text-align:left;"></td></tr><tr><td style="text-align:left;">201</td><td style="text-align:left;">INCOMPATIBLE_VERSION</td><td style="text-align:left;">Incompatible version</td></tr><tr><td style="text-align:left;">202</td><td style="text-align:left;">CONFIGURATION_ERROR</td><td style="text-align:left;">Configuration error</td></tr><tr><td style="text-align:left;">203</td><td style="text-align:left;">START_UP_ERROR</td><td style="text-align:left;">Meet error while starting</td></tr><tr><td style="text-align:left;">204</td><td style="text-align:left;">SHUT_DOWN_ERROR</td><td style="text-align:left;">Meet error while shutdown</td></tr><tr><td style="text-align:left;">300</td><td style="text-align:left;">UNSUPPORTED_OPERATION</td><td style="text-align:left;">Unsupported operation</td></tr><tr><td style="text-align:left;">301</td><td style="text-align:left;">EXECUTE_STATEMENT_ERROR</td><td style="text-align:left;">Execute statement error</td></tr><tr><td style="text-align:left;">302</td><td style="text-align:left;">MULTIPLE_ERROR</td><td style="text-align:left;">Meet error when executing multiple statements</td></tr><tr><td style="text-align:left;">303</td><td style="text-align:left;">ILLEGAL_PARAMETER</td><td style="text-align:left;">Parameter is illegal</td></tr><tr><td style="text-align:left;">304</td><td style="text-align:left;">OVERLAP_WITH_EXISTING_TASK</td><td style="text-align:left;">Current task has some conflict with existing tasks</td></tr><tr><td style="text-align:left;">305</td><td style="text-align:left;">INTERNAL_SERVER_ERROR</td><td style="text-align:left;">Internal server error</td></tr><tr><td style="text-align:left;">306</td><td style="text-align:left;">DISPATCH_ERROR</td><td style="text-align:left;">Meet error while dispatching</td></tr><tr><td style="text-align:left;">400</td><td style="text-align:left;">REDIRECTION_RECOMMEND</td><td style="text-align:left;">Recommend Client redirection</td></tr><tr><td style="text-align:left;">500</td><td style="text-align:left;">DATABASE_NOT_EXIST</td><td style="text-align:left;">Database does not exist</td></tr><tr><td style="text-align:left;">501</td><td style="text-align:left;">DATABASE_ALREADY_EXISTS</td><td style="text-align:left;">Database already exist</td></tr><tr><td style="text-align:left;">502</td><td style="text-align:left;">SERIES_OVERFLOW</td><td style="text-align:left;">Series number exceeds the threshold</td></tr><tr><td style="text-align:left;">503</td><td style="text-align:left;">TIMESERIES_ALREADY_EXIST</td><td style="text-align:left;">Timeseries already exists</td></tr><tr><td style="text-align:left;">504</td><td style="text-align:left;">TIMESERIES_IN_BLACK_LIST</td><td style="text-align:left;">Timeseries is being deleted</td></tr><tr><td style="text-align:left;">505</td><td style="text-align:left;">ALIAS_ALREADY_EXIST</td><td style="text-align:left;">Alias already exists</td></tr><tr><td style="text-align:left;">506</td><td style="text-align:left;">PATH_ALREADY_EXIST</td><td style="text-align:left;">Path already exists</td></tr><tr><td style="text-align:left;">507</td><td style="text-align:left;">METADATA_ERROR</td><td style="text-align:left;">Meet error when dealing with metadata</td></tr><tr><td style="text-align:left;">508</td><td style="text-align:left;">PATH_NOT_EXIST</td><td style="text-align:left;">Path does not exist</td></tr><tr><td style="text-align:left;">509</td><td style="text-align:left;">ILLEGAL_PATH</td><td style="text-align:left;">Illegal path</td></tr><tr><td style="text-align:left;">510</td><td style="text-align:left;">CREATE_TEMPLATE_ERROR</td><td style="text-align:left;">Create schema template error</td></tr><tr><td style="text-align:left;">511</td><td style="text-align:left;">DUPLICATED_TEMPLATE</td><td style="text-align:left;">Schema template is duplicated</td></tr><tr><td style="text-align:left;">512</td><td style="text-align:left;">UNDEFINED_TEMPLATE</td><td style="text-align:left;">Schema template is not defined</td></tr><tr><td style="text-align:left;">513</td><td style="text-align:left;">TEMPLATE_NOT_SET</td><td style="text-align:left;">Schema template is not set</td></tr><tr><td style="text-align:left;">514</td><td style="text-align:left;">DIFFERENT_TEMPLATE</td><td style="text-align:left;">Template is not consistent</td></tr><tr><td style="text-align:left;">515</td><td style="text-align:left;">TEMPLATE_IS_IN_USE</td><td style="text-align:left;">Template is in use</td></tr><tr><td style="text-align:left;">516</td><td style="text-align:left;">TEMPLATE_INCOMPATIBLE</td><td style="text-align:left;">Template is not compatible</td></tr><tr><td style="text-align:left;">517</td><td style="text-align:left;">SEGMENT_NOT_FOUND</td><td style="text-align:left;">Segment not found</td></tr><tr><td style="text-align:left;">518</td><td style="text-align:left;">PAGE_OUT_OF_SPACE</td><td style="text-align:left;">No enough space on schema page</td></tr><tr><td style="text-align:left;">519</td><td style="text-align:left;">RECORD_DUPLICATED</td><td style="text-align:left;">Record is duplicated</td></tr><tr><td style="text-align:left;">520</td><td style="text-align:left;">SEGMENT_OUT_OF_SPACE</td><td style="text-align:left;">No enough space on schema segment</td></tr><tr><td style="text-align:left;">521</td><td style="text-align:left;">PBTREE_FILE_NOT_EXISTS</td><td style="text-align:left;">PBTreeFile does not exist</td></tr><tr><td style="text-align:left;">522</td><td style="text-align:left;">OVERSIZE_RECORD</td><td style="text-align:left;">Size of record exceeds the threshold of page of PBTreeFile</td></tr><tr><td style="text-align:left;">523</td><td style="text-align:left;">PBTREE_FILE_REDO_LOG_BROKEN</td><td style="text-align:left;">PBTreeFile redo log has broken</td></tr><tr><td style="text-align:left;">524</td><td style="text-align:left;">TEMPLATE_NOT_ACTIVATED</td><td style="text-align:left;">Schema template is not activated</td></tr><tr><td style="text-align:left;">526</td><td style="text-align:left;">SCHEMA_QUOTA_EXCEEDED</td><td style="text-align:left;">Schema usage exceeds quota limit</td></tr><tr><td style="text-align:left;">527</td><td style="text-align:left;">MEASUREMENT_ALREADY_EXISTS_IN_TEMPLATE</td><td style="text-align:left;">Measurement already exists in schema template</td></tr><tr><td style="text-align:left;">600</td><td style="text-align:left;">SYSTEM_READ_ONLY</td><td style="text-align:left;">IoTDB system is read only</td></tr><tr><td style="text-align:left;">601</td><td style="text-align:left;">STORAGE_ENGINE_ERROR</td><td style="text-align:left;">Storage engine related error</td></tr><tr><td style="text-align:left;">602</td><td style="text-align:left;">STORAGE_ENGINE_NOT_READY</td><td style="text-align:left;">The storage engine is in recovery, not ready fore accepting read/write operation</td></tr><tr><td style="text-align:left;">603</td><td style="text-align:left;">DATAREGION_PROCESS_ERROR</td><td style="text-align:left;">DataRegion related error</td></tr><tr><td style="text-align:left;">604</td><td style="text-align:left;">TSFILE_PROCESSOR_ERROR</td><td style="text-align:left;">TsFile processor related error</td></tr><tr><td style="text-align:left;">605</td><td style="text-align:left;">WRITE_PROCESS_ERROR</td><td style="text-align:left;">Writing data related error</td></tr><tr><td style="text-align:left;">606</td><td style="text-align:left;">WRITE_PROCESS_REJECT</td><td style="text-align:left;">Writing data rejected error</td></tr><tr><td style="text-align:left;">607</td><td style="text-align:left;">OUT_OF_TTL</td><td style="text-align:left;">Insertion time is less than TTL time bound</td></tr><tr><td style="text-align:left;">608</td><td style="text-align:left;">COMPACTION_ERROR</td><td style="text-align:left;">Meet error while merging</td></tr><tr><td style="text-align:left;">609</td><td style="text-align:left;">ALIGNED_TIMESERIES_ERROR</td><td style="text-align:left;">Meet error in aligned timeseries</td></tr><tr><td style="text-align:left;">610</td><td style="text-align:left;">WAL_ERROR</td><td style="text-align:left;">WAL error</td></tr><tr><td style="text-align:left;">611</td><td style="text-align:left;">DISK_SPACE_INSUFFICIENT</td><td style="text-align:left;">Disk space is insufficient</td></tr><tr><td style="text-align:left;">700</td><td style="text-align:left;">SQL_PARSE_ERROR</td><td style="text-align:left;">Meet error while parsing SQL</td></tr><tr><td style="text-align:left;">701</td><td style="text-align:left;">SEMANTIC_ERROR</td><td style="text-align:left;">SQL semantic error</td></tr><tr><td style="text-align:left;">702</td><td style="text-align:left;">GENERATE_TIME_ZONE_ERROR</td><td style="text-align:left;">Meet error while generating time zone</td></tr><tr><td style="text-align:left;">703</td><td style="text-align:left;">SET_TIME_ZONE_ERROR</td><td style="text-align:left;">Meet error while setting time zone</td></tr><tr><td style="text-align:left;">704</td><td style="text-align:left;">QUERY_NOT_ALLOWED</td><td style="text-align:left;">Query statements are not allowed error</td></tr><tr><td style="text-align:left;">705</td><td style="text-align:left;">LOGICAL_OPERATOR_ERROR</td><td style="text-align:left;">Logical operator related error</td></tr><tr><td style="text-align:left;">706</td><td style="text-align:left;">LOGICAL_OPTIMIZE_ERROR</td><td style="text-align:left;">Logical optimize related error</td></tr><tr><td style="text-align:left;">707</td><td style="text-align:left;">UNSUPPORTED_FILL_TYPE</td><td style="text-align:left;">Unsupported fill type related error</td></tr><tr><td style="text-align:left;">708</td><td style="text-align:left;">QUERY_PROCESS_ERROR</td><td style="text-align:left;">Query process related error</td></tr><tr><td style="text-align:left;">709</td><td style="text-align:left;">MPP_MEMORY_NOT_ENOUGH</td><td style="text-align:left;">Not enough memory for task execution in MPP</td></tr><tr><td style="text-align:left;">710</td><td style="text-align:left;">CLOSE_OPERATION_ERROR</td><td style="text-align:left;">Meet error in close operation</td></tr><tr><td style="text-align:left;">711</td><td style="text-align:left;">TSBLOCK_SERIALIZE_ERROR</td><td style="text-align:left;">TsBlock serialization error</td></tr><tr><td style="text-align:left;">712</td><td style="text-align:left;">INTERNAL_REQUEST_TIME_OUT</td><td style="text-align:left;">MPP Operation timeout</td></tr><tr><td style="text-align:left;">713</td><td style="text-align:left;">INTERNAL_REQUEST_RETRY_ERROR</td><td style="text-align:left;">Internal operation retry failed</td></tr><tr><td style="text-align:left;">714</td><td style="text-align:left;">NO_SUCH_QUERY</td><td style="text-align:left;">Cannot find target query</td></tr><tr><td style="text-align:left;">715</td><td style="text-align:left;">QUERY_WAS_KILLED</td><td style="text-align:left;">Query was killed when execute</td></tr><tr><td style="text-align:left;">800</td><td style="text-align:left;">UNINITIALIZED_AUTH_ERROR</td><td style="text-align:left;">Failed to initialize auth module</td></tr><tr><td style="text-align:left;">801</td><td style="text-align:left;">WRONG_LOGIN_PASSWORD</td><td style="text-align:left;">Username or password is wrong</td></tr><tr><td style="text-align:left;">802</td><td style="text-align:left;">NOT_LOGIN</td><td style="text-align:left;">Not login</td></tr><tr><td style="text-align:left;">803</td><td style="text-align:left;">NO_PERMISSION</td><td style="text-align:left;">No permisstion to operate</td></tr><tr><td style="text-align:left;">804</td><td style="text-align:left;">USER_NOT_EXIST</td><td style="text-align:left;">User not exists</td></tr><tr><td style="text-align:left;">805</td><td style="text-align:left;">USER_ALREADY_EXIST</td><td style="text-align:left;">User already exists</td></tr><tr><td style="text-align:left;">806</td><td style="text-align:left;">USER_ALREADY_HAS_ROLE</td><td style="text-align:left;">User already has target role</td></tr><tr><td style="text-align:left;">807</td><td style="text-align:left;">USER_NOT_HAS_ROLE</td><td style="text-align:left;">User not has target role</td></tr><tr><td style="text-align:left;">808</td><td style="text-align:left;">ROLE_NOT_EXIST</td><td style="text-align:left;">Role not exists</td></tr><tr><td style="text-align:left;">809</td><td style="text-align:left;">ROLE_ALREADY_EXIST</td><td style="text-align:left;">Role already exists</td></tr><tr><td style="text-align:left;">810</td><td style="text-align:left;">ALREADY_HAS_PRIVILEGE</td><td style="text-align:left;">Already has privilege</td></tr><tr><td style="text-align:left;">811</td><td style="text-align:left;">NOT_HAS_PRIVILEGE</td><td style="text-align:left;">Not has privilege</td></tr><tr><td style="text-align:left;">812</td><td style="text-align:left;">CLEAR_PERMISSION_CACHE_ERROR</td><td style="text-align:left;">Failed to clear permission cache</td></tr><tr><td style="text-align:left;">813</td><td style="text-align:left;">UNKNOWN_AUTH_PRIVILEGE</td><td style="text-align:left;">Unknown auth privilege</td></tr><tr><td style="text-align:left;">814</td><td style="text-align:left;">UNSUPPORTED_AUTH_OPERATION</td><td style="text-align:left;">Unsupported auth operation</td></tr><tr><td style="text-align:left;">815</td><td style="text-align:left;">AUTH_IO_EXCEPTION</td><td style="text-align:left;">IO Exception in auth module</td></tr><tr><td style="text-align:left;">900</td><td style="text-align:left;">MIGRATE_REGION_ERROR</td><td style="text-align:left;">Error when migrate region</td></tr><tr><td style="text-align:left;">901</td><td style="text-align:left;">CREATE_REGION_ERROR</td><td style="text-align:left;">Create region error</td></tr><tr><td style="text-align:left;">902</td><td style="text-align:left;">DELETE_REGION_ERROR</td><td style="text-align:left;">Delete region error</td></tr><tr><td style="text-align:left;">903</td><td style="text-align:left;">PARTITION_CACHE_UPDATE_ERROR</td><td style="text-align:left;">Update partition cache failed</td></tr><tr><td style="text-align:left;">904</td><td style="text-align:left;">CONSENSUS_NOT_INITIALIZED</td><td style="text-align:left;">Consensus is not initialized and cannot provide service</td></tr><tr><td style="text-align:left;">905</td><td style="text-align:left;">REGION_LEADER_CHANGE_ERROR</td><td style="text-align:left;">Region leader migration failed</td></tr><tr><td style="text-align:left;">906</td><td style="text-align:left;">NO_AVAILABLE_REGION_GROUP</td><td style="text-align:left;">Cannot find an available region group</td></tr><tr><td style="text-align:left;">907</td><td style="text-align:left;">LACK_DATA_PARTITION_ALLOCATION</td><td style="text-align:left;">Lacked some data partition allocation result in the response</td></tr><tr><td style="text-align:left;">1000</td><td style="text-align:left;">DATANODE_ALREADY_REGISTERED</td><td style="text-align:left;">DataNode already registered in cluster</td></tr><tr><td style="text-align:left;">1001</td><td style="text-align:left;">NO_ENOUGH_DATANODE</td><td style="text-align:left;">The number of DataNode is not enough, cannot remove DataNode or create enough replication</td></tr><tr><td style="text-align:left;">1002</td><td style="text-align:left;">ADD_CONFIGNODE_ERROR</td><td style="text-align:left;">Add ConfigNode error</td></tr><tr><td style="text-align:left;">1003</td><td style="text-align:left;">REMOVE_CONFIGNODE_ERROR</td><td style="text-align:left;">Remove ConfigNode error</td></tr><tr><td style="text-align:left;">1004</td><td style="text-align:left;">DATANODE_NOT_EXIST</td><td style="text-align:left;">DataNode not exist error</td></tr><tr><td style="text-align:left;">1005</td><td style="text-align:left;">DATANODE_STOP_ERROR</td><td style="text-align:left;">DataNode stop error</td></tr><tr><td style="text-align:left;">1006</td><td style="text-align:left;">REMOVE_DATANODE_ERROR</td><td style="text-align:left;">Remove datanode failed</td></tr><tr><td style="text-align:left;">1007</td><td style="text-align:left;">REGISTER_DATANODE_WITH_WRONG_ID</td><td style="text-align:left;">The DataNode to be registered has incorrect register id</td></tr><tr><td style="text-align:left;">1008</td><td style="text-align:left;">CAN_NOT_CONNECT_DATANODE</td><td style="text-align:left;">Can not connect to DataNode</td></tr><tr><td style="text-align:left;">1100</td><td style="text-align:left;">LOAD_FILE_ERROR</td><td style="text-align:left;">Meet error while loading file</td></tr><tr><td style="text-align:left;">1101</td><td style="text-align:left;">LOAD_PIECE_OF_TSFILE_ERROR</td><td style="text-align:left;">Error when load a piece of TsFile when loading</td></tr><tr><td style="text-align:left;">1102</td><td style="text-align:left;">DESERIALIZE_PIECE_OF_TSFILE_ERROR</td><td style="text-align:left;">Error when deserialize a piece of TsFile</td></tr><tr><td style="text-align:left;">1103</td><td style="text-align:left;">SYNC_CONNECTION_ERROR</td><td style="text-align:left;">Sync connection error</td></tr><tr><td style="text-align:left;">1104</td><td style="text-align:left;">SYNC_FILE_REDIRECTION_ERROR</td><td style="text-align:left;">Sync TsFile redirection error</td></tr><tr><td style="text-align:left;">1105</td><td style="text-align:left;">SYNC_FILE_ERROR</td><td style="text-align:left;">Sync TsFile error</td></tr><tr><td style="text-align:left;">1106</td><td style="text-align:left;">CREATE_PIPE_SINK_ERROR</td><td style="text-align:left;">Failed to create a PIPE sink</td></tr><tr><td style="text-align:left;">1107</td><td style="text-align:left;">PIPE_ERROR</td><td style="text-align:left;">PIPE error</td></tr><tr><td style="text-align:left;">1108</td><td style="text-align:left;">PIPESERVER_ERROR</td><td style="text-align:left;">PIPE server error</td></tr><tr><td style="text-align:left;">1109</td><td style="text-align:left;">VERIFY_METADATA_ERROR</td><td style="text-align:left;">Meet error in validate timeseries schema</td></tr><tr><td style="text-align:left;">1200</td><td style="text-align:left;">UDF_LOAD_CLASS_ERROR</td><td style="text-align:left;">Error when loading UDF class</td></tr><tr><td style="text-align:left;">1201</td><td style="text-align:left;">UDF_DOWNLOAD_ERROR</td><td style="text-align:left;">DataNode cannot download UDF from ConfigNode</td></tr><tr><td style="text-align:left;">1202</td><td style="text-align:left;">CREATE_UDF_ON_DATANODE_ERROR</td><td style="text-align:left;">Error when create UDF on DataNode</td></tr><tr><td style="text-align:left;">1203</td><td style="text-align:left;">DROP_UDF_ON_DATANODE_ERROR</td><td style="text-align:left;">Error when drop a UDF on DataNode</td></tr><tr><td style="text-align:left;">1300</td><td style="text-align:left;">CREATE_TRIGGER_ERROR</td><td style="text-align:left;">ConfigNode create trigger error</td></tr><tr><td style="text-align:left;">1301</td><td style="text-align:left;">DROP_TRIGGER_ERROR</td><td style="text-align:left;">ConfigNode delete Trigger error</td></tr><tr><td style="text-align:left;">1302</td><td style="text-align:left;">TRIGGER_FIRE_ERROR</td><td style="text-align:left;">Error when firing trigger</td></tr><tr><td style="text-align:left;">1303</td><td style="text-align:left;">TRIGGER_LOAD_CLASS_ERROR</td><td style="text-align:left;">Error when load class of trigger</td></tr><tr><td style="text-align:left;">1304</td><td style="text-align:left;">TRIGGER_DOWNLOAD_ERROR</td><td style="text-align:left;">Error when download trigger from ConfigNode</td></tr><tr><td style="text-align:left;">1305</td><td style="text-align:left;">CREATE_TRIGGER_INSTANCE_ERROR</td><td style="text-align:left;">Error when create trigger instance</td></tr><tr><td style="text-align:left;">1306</td><td style="text-align:left;">ACTIVE_TRIGGER_INSTANCE_ERROR</td><td style="text-align:left;">Error when activate trigger instance</td></tr><tr><td style="text-align:left;">1307</td><td style="text-align:left;">DROP_TRIGGER_INSTANCE_ERROR</td><td style="text-align:left;">Error when drop trigger instance</td></tr><tr><td style="text-align:left;">1308</td><td style="text-align:left;">UPDATE_TRIGGER_LOCATION_ERROR</td><td style="text-align:left;">Error when move stateful trigger to new datanode</td></tr><tr><td style="text-align:left;">1400</td><td style="text-align:left;">NO_SUCH_CQ</td><td style="text-align:left;">CQ task does not exist</td></tr><tr><td style="text-align:left;">1401</td><td style="text-align:left;">CQ_ALREADY_ACTIVE</td><td style="text-align:left;">CQ is already active</td></tr><tr><td style="text-align:left;">1402</td><td style="text-align:left;">CQ_AlREADY_EXIST</td><td style="text-align:left;">CQ is already exist</td></tr><tr><td style="text-align:left;">1403</td><td style="text-align:left;">CQ_UPDATE_LAST_EXEC_TIME_ERROR</td><td style="text-align:left;">CQ update last execution time failed</td></tr></tbody></table><blockquote><p>All exceptions are refactored in the latest version by extracting uniform message into exception classes. Different error codes are added to all exceptions. When an exception is caught and a higher-level exception is thrown, the error code will keep and pass so that users will know the detailed error reason.<br> A base exception class &quot;ProcessException&quot; is also added to be extended by all exceptions.</p></blockquote></div><!--[--><!----><!--]--><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a href="https://github.com/apache/iotdb-docs/edit/main/src/UserGuide/V1.2.x/Reference/Status-Codes.md" rel="noopener noreferrer" target="_blank" aria-label="Found Error? 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