diff --git a/maven-project/src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java b/maven-project/src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java
index bf6af4fb82..b87e2bfc00 100644
--- a/maven-project/src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java
+++ b/maven-project/src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java
@@ -312,7 +312,7 @@ public class DefaultMavenProjectBuilder
                     }
                     catch ( IllegalStateException collisionException )
                     {
-                        throw new ProjectBuildingException( "Detected illegal plugin-execution configuration in: " + pomLocation, collisionException ); 
+                        throw new ProjectBuildingException( "Detected illegal plugin-execution configuration in: " + pomLocation + " Error output: \n\n" + collisionException.getMessage(), collisionException ); 
                     }
                 }
             }