Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.

I am using Visual Studio 2008.  I have a default.aspx page that has an AJax Update Panel on it with a datagrid inside it. The datagrid has a LinkButton column and when the user clicks the data, the code behind does a Response.Redirect("myPage.aspx", true); I get this error message after the Page_Load of the myPage fires.  If I take the Update Panel off the default.aspx page, then it runs with no problems.  Is there any solutions to keeping the update panel on the webpage and doing a response.redirect? The full error message is this.

 Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.
Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules,
or server trace is enabled.
Details: Error parsing near '

<!DOCTYPE html P'.

 

Thanks
Chr ...