GWT Designer issue

Hi,

 

please help , i am not able to open java file in GWT designer.

 

Internal Error

encountered unexpected internal error.

This could be caused by a bug or by a misconfiguration issue, conflict, partial update, etc.

java.lang.NoSuchMethodError: com.google.gwt.dev.cfg.ModuleDefLoader.loadFromClassPath(Lcom/google/gwt/core/ext/TreeLogger;Ljava/lang/String;Z)Lcom/google/gwt/dev/cfg/ModuleDef;

Show stack trace.

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Thanks...

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