Hi @Zolotoy ,
Most common reasons for the error:
Calls to Response.Write():
Response filters
HttpModules
Server trace is enabled
Calls to Server.Transfer()
Please refer : http://stackoverflow.com/questions/290121/asp-net-ajax-error-sys-webforms-pagerequestmanagerparsererrorexception
In addition, suppose that you want make a popup message in the SSRS report.
I find another simple way to meet your needs.
Regards,
Zoe
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