Problem with upgrade/thumbnails

[loopus]

Hello, I have a really big problem with two things.
When I wanna choose thumbnail (to album) it shows /in the admin panel/ thumbnails from all album.
So I tried to upgrade my coppermine from 1.4.16 to 1.5.x ;
1. I created backup of config.php, config.php.inc and the album folder
2. Downloaded the newest version from the coppermine web and unpacked it
3.Copied all the files to FTP
4.Copied config.php, confing.php.inc and the albums folder back to the FTP
Now, when I go to my gallery domain it writes only Fatal error:
Also tried /update.php/ : writed another errror.

Please help fast!!
Its really urgent:(

[Αndré]

Please post the error message you get at update.php. Alternatively there are already some threads dealing with the issue you described.