EventValidation error with Excel export

Jul 10, 2010 at 2:56 PM

I created a publishing page and inserted the Rollup webpart and Excel export webpart on the page. I connected the excel webpart to the rollup. However when i click the export button I get the follwing error:

Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

What am I doing wrong or how can i overcome this error?