mobasshir wrote:
<customerrors mode="RemoteOnly" defaultredirect="mycustompage.htm" />
Please put off the custom error tag or set the mode to 'off'. Re-run and then update the question with the actual error with trace.
currently, it could be any reason. You need to narrow down with the exact error to deal with it.
If you can replicate it in Dev environment, then that too might help you.