Tomcat Error : OutPutstream is already being used for this request

I'using Jdev3.2 to develop an application based on the dataweb
beans.
I'm using the EditCurrentRecord, and the function UseListOfValue
to disply lovs.
I deployed the application on tomcat, when the page is displayed
an execption occur which is 'OutPutstream is already being used
for this request'
can someone help me please
THX in advance
Ghassen

can someone help?
Please

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