Resolved [Pls Help Me] Login page goes blank after upgrading plesk

[bibiugly]

Hello friends,
Today I have upgraded my plesk version from plesk onyx to plesk obsidian.
And then I can't login to the admin page.
Hope you guys can help me as I don't know what to do next.
Thank you very much.

 

[bibiugly]

The error was fixed when I ran the following command with cmd as administrator:

plesk repair installation