Compilation unit indirectly references the missing type java.lang.Object

Hi All,
I am getting the below mentioned error
"This Compilation unit indirectly references the missing type java.lang.Object (typically some required class file is referencing a type outside the class path)"
Please someone help me resolve this issue.
Thanks
Uday

I am getting a new type of error
each time i am deleting a  method which duplicate, its getting created again.
           catch(WDDynamicRFCExecuteException wddree){
      wddree.printStackTrace(); }
  public void onActionExit(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActionExit(ServerEvent)
    //@@end
  //@@begin javadoc:onActionExit(ServerEvent)
  /** Declared validating event handler. */
  //@@end
  public void onActionExit(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActionExit(ServerEvent)
    //@@end
  //@@begin javadoc:onActionSelect(ServerEvent)
  /** Declared validating event handler. */
  //@@end
  public void onActionSelect(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActionSelect(ServerEvent)
    //@@end
The following code section can be used for any Java code that is
not to be visible to other controllers/views or that contains constructs
currently not supported directly by Web Dynpro (such as inner classes or
member variables etc.). </p>
Note: The content of this section is in no way managed/controlled
by the Web Dynpro Designtime or the Web Dynpro Runtime.
  //@@begin others
  //@@end

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