Error 500 on Report entity

[sujithraalink]

It shows error 500 on Report entity. Can't create reports also. it shows error 500. i cleared cache and rebuild it. still shows error 500 on clicking the reports. There are no errors found on logs. Please help me to resolve the issue. I have used advanced pack 2.1.0

[Maximus]

Hello.
Please check the web server error log. It looks like a server-side error.