title: com.google.gwt.core.client.JavaScriptException: (TypeError): Cannot read property 'C' of null
body: <p>I have defined the following custom tag <code>&lt;custlib:mytag myttribute="myval"/&gt;</code></p>
  
  <p>While I execute this gwt app and try to process the custlib:mytag it works fine in hosted dev mode.. where as in the web mode I get the following exception</p>
  
  <pre><code>Thu Mar 27 12:11:19 GMT+530 2014 HTMLPROCESSOR SEVERE: processor excep
  com.google.gwt.core.client.JavaScriptException: (TypeError): Cannot read property 'C' of null
     at Unknown.Dn(StackTraceCreator.java:168)
     at Unknown.Em(StackTraceCreator.java:421)
     at Unknown.ES(Exceptions.java:29)
     at Unknown.ci(UIObject.java:528)
     at Unknown.ai(HTMLPanel.java:183)
     at Unknown.lh(HtmlPageProcessor.java:179)
     at Unknown.mh(HtmlPageProcessor.java:91)
     at Unknown.mh(HtmlPageProcessor.java:81)
     at Unknown.mh(HtmlPageProcessor.java:81)
     at Unknown.mh(HtmlPageProcessor.java:81)
     at Unknown.mh(HtmlPageProcessor.java:81)
     at Unknown.mh(HtmlPageProcessor.java:81)
     at Unknown.bb(HtmlPageProcessor.java:37)
     at Unknown.DS(Stats.java:28)
     at Unknown._m(Impl.java:168)
     at Unknown.cn(Impl.java:220)
     at Unknown.anonymous(Impl.java:57)
     at Unknown.gwtOnLoad(com.google.gwt.dev.jjs.impl.GenerateJavaScriptAST:0)
  Thu Mar 27 12:11:19 GMT+530 2014 HTMLPROCESSOR SEVERE: processor excep
  com.google.gwt.core.client.JavaScriptException: (TypeError): Cannot read property 'C' of null
  </code></pre>
  
  <p>What could be the issue.. ? </p>
  
  <p>Any help would be appreciated. . </p>