EPCM error when leave Webdynpro page ???

Question

In Portal, when navigate from page with webdynpro iViews to any other workset or page, clicking in some node of the top level navigation, opening a windows alert popup , and said: Exception in EventDistribute occurred. Throw it to upper level?
And then click accept 4 times let me continue.
After trying multiple alternatives, the issue certainly is occurring when:  I am in a page with at least one webdynpro java, and I go to another. That is, to leave or close the webdynpro iView has generated  the problem.
When I choose "debug" the exception with MS Dev studio, I found this error code, this is the point when the exception raise:
EPCM.eventDistribute=function( consumers, eventObject, resultArray){
var isRetValCollect=(resultArray != null);
var eListener
var retVal;
for (var idx in consumers){
eListener=consumers[idx];
retVal=null;
try{
retVal=eListener.call( eventObject );}
catch( e){
if (EPCM._private.dbgException){
if(confirm("Exception in EventDistribute occured.\nThrow it to upper level ?")) throw(e);}
if(isRetValCollect && retVal != null){
resultArray[resultArray.length++]=retVal;}
any suggestion ?????
thanks in advance!
Leandro.

Answer 1

Add this: not only when leave a webdynpro iview or page is the problem, also when resizing a webdynpro page in the IE.
Any change in the screen size, raise this popup error
any idea???
thanks in advance