Correct print errors
diff --git a/heron/executor/src/python/heron_executor.py b/heron/executor/src/python/heron_executor.py
index 0e8b18a..87f810f 100755
--- a/heron/executor/src/python/heron_executor.py
+++ b/heron/executor/src/python/heron_executor.py
@@ -830,7 +830,7 @@
 
       proc.async_stream_process_stdout(process, stdout_log_fn(name))
     except Exception:
-      Log.info("Exception running command %:", cmd)
+      Log.info("Exception running command %s", cmd)
       traceback.print_exc()
 
     return process
@@ -846,7 +846,7 @@
       # wait for termination
       self._wait_process_std_out_err(cmd, process)
     except Exception:
-      Log.info("Exception running command %:", cmd)
+      Log.info("Exception running command %s", cmd)
       traceback.print_exc()
 
     # return the exit code