Put Core Mod Error Behind a Proxy.

server/ServerHelper.java

@@ -154,4 +154,9 @@ public class ServerHelper extends CommonHelper
 
 	}
 
+	@Override
+	public void missingCoreMod()
+	{
+		throw new RuntimeException( "Unable to Load Core Mod, please verify that AE2 is properly install in the mods folder, with a .jar extention." );
+	}
 }