ASP.NET C# Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.

The Error:

<asp:AsyncPostBackTrigger ControlID="Timer1" />





The Solutions:


Change 
<asp:AsyncPostBackTrigger ControlID="Timer1" />

to 
<asp:PostBackTrigger ControlID="Timer1" />






Reference Solution:

https://social.msdn.microsoft.com/Forums/en-US/cc3f69ee-6634-4f2c-ab97-0427825ce0e4/syswebformspagerequestmanagerparsererrorexception-the-message-received-from-the-server-could-not?forum=aspwebforms#:~:text=WebForms.-,PageRequestManagerParserErrorException%3A%20The%20message%20received%20from%20the%20server%20could%20not%20be,or%20server%20trace%20is%20enabled.

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