[MNG-5001] updated error message to better match Maven 2
diff --git a/maven-core/src/main/java/org/apache/maven/plugin/internal/DefaultMavenPluginManager.java b/maven-core/src/main/java/org/apache/maven/plugin/internal/DefaultMavenPluginManager.java
index 89d8d0d..89cc2e2 100644
--- a/maven-core/src/main/java/org/apache/maven/plugin/internal/DefaultMavenPluginManager.java
+++ b/maven-core/src/main/java/org/apache/maven/plugin/internal/DefaultMavenPluginManager.java
@@ -787,7 +787,8 @@
             if ( value != null && defaultValue != null && !Objects.equals( defaultValue, value ) )
             {
                 invalidParameters.add( parameter );
-                logger.error( "Setting read-only parameter '" + parameter.getName() + "' to " + value );
+                logger.error( "Invalid plugin configuration: Cannot override read-only parameter '"
+                    + parameter.getName() + "' in goal '" + mojoDescriptor.getGoal() + "'" );
             }
         }