I have an aspx page in SharePoint's _layout folder. This page loads user controls from the controltemplates folder. User controls has ajax update panels.
I am getting below error when I'm working with page.
Message: 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 '<HTML dir="ltr"> <H'. Line: 4723 Char: 21 Code: 0 URI: http://mysitename.com/ScriptResource.axd?d=5kqA7Nw-EeaK3p4QkMYAWi......
Please help me to resolve this.