I have SharePoint site which was working fine. My site has custom page with custom visual web parts. Suddenly i am getting Web Parts Maintenance Page error when accessing my page. I tried to find any clues in SharePoint log files but i can't find out the reason for this error. Can anyone tell me the possible scenarios for this kind of error?
Actually the reason can be thousand. Are you using custom web parts? What that does?
Usually into ULS log you have all the reason about errors.
I suggest to you to use something like this: https://sharepointlogviewer.codeplex.com/
to understand what's going on.