PR: MPCHANGELOG-51

Submitted By:	Paul Sundling
Improve error message when not using CVS, and changelog factory not set


git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@126033 13f79535-47bb-0310-9956-ffa450edef68

changelog/src/main/org/apache/maven/cvslib/CvsChangeLogGenerator.java

@@ -128,7 +128,13 @@ class CvsChangeLogGenerator extends AbstractChangeLogGenerator
         {
             throw new IllegalArgumentException(
                 "repository connection string"
-                    + " does not specify 'cvs' as the scm");
+                    + " does not specify 'cvs' as the scm"
+                    + System.getProperty("line.separator") 
+                    + "If using another scm, maven.changelog.factory"
+                    + " must be set." 
+                    + System.getProperty("line.separator")
+                    + "See the maven changelog plugin documentation" 
+                    + " for correct settings."  );
         }
 
         Commandline command = new Commandline();