How to rectify this issues: asp.net PageRequestManagerParserErrorException

i have a search panel where on click of search button im getting this exception this is for the first time, subsequent click it result the proper result.

Can any one explain how solve the issue.

error message:

Sys.WebForms.PageRequestManagerParserErrorException: The Message received from the server could not be parsed.Coommon causes for this error are when the response is modified by Calls to Repose.Write(), response filters,HttpModules, or server trace is enabled. Details:开发者_StackOverflow社区Error Parsing near ' | '.

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It seems you are using update panel and using response.write both at the same time, (or using register script ) please post your code (sample minified) so that we can give more proper hint