I've added a new display panel type component to a GWT app and now there is 
a error on the js console as below. The Java compiles fine and gwtc 
compiles without error.

What can be wrong?

regards,
John

     [java] Aug 02, 2016 3:32:42 PM java.util.prefs.WindowsPreferences 
<init>
     [java] WARNING: Could not open/create prefs root node 
Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) 
returned error code 5.
     [java] Compiling module chat.app
     [java]    Compiling 5 permutations
     [java]       Compiling permutation 0...
     [java]       Compiling permutation 1...
     [java]       Compiling permutation 2...
     [java]       Compiling permutation 3...
     [java]       Compiling permutation 4...
     [java]    Compile of permutations succeeded
     [java]    Compilation succeeded -- 31.637s
     [java] Linking into C:\Users\John\workspace\Chat_GWT1\war\app; Writing 
extras to C:\Users\John\workspace\Chat_GWT1\extras\app
     [java]    Link succeeded
     [java]    Linking succeeded -- 2.162s

Uncaught TypeError: Cannot read property 'J' of undefined

   1. 
      ed @ app-0.js:762
      vd @ app-0.js:505
      jw @ app-0.js:268
      fc @ app-0.js:861
      Z @ app-0.js:874
      _s @ app-0.js:479
      g @ app-0.js:769
      Jg @ app-0.js:384
      Mg @ app-0.js:540
      (anonymous function) @ app-0.js:541
      Xs @ app-0.js:770
      (anonymous function) @ app-0.js:879
      (anonymous function) @ VM724:1
      m @ app.nocache.js:9
      (anonymous function) @ app.nocache.js:10
      d @ app.nocache.js:6
      (anonymous function) @ app.nocache.js:7
   


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