![c# - Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server." - Stack Overflow c# - Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server." - Stack Overflow](https://i.stack.imgur.com/cE5ce.png)
c# - Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server." - Stack Overflow
Solved: Sys.WebForms.PageRequestManagerTimeoutException – The server request timed out error | Consult Rikin
![.NET - How to fix error Message 'Sys WebForms PageRequestManager' is null or not an object - YouTube .NET - How to fix error Message 'Sys WebForms PageRequestManager' is null or not an object - YouTube](https://i.ytimg.com/vi/IR_V89QmhQk/mqdefault.jpg)