Upgrade unsuccesfull - returning "unknown error" with migrate and login

[endelavit]

Hi alle experts

I have a problem.
I've tried to upgrade from 1.2.12 to 2.0.1.
I've succeded most of the way. However I'm not able to login with e-mail address and password. It just returns with "unknown error"
I have overwritten the files at ftp as said at the upgrade site. Afterwards I have changed the config.php file with the same info from the old config.php file
I have tried to read the installation.html file and tried to migrate the database, but it also returns with "Unknown error"

Could someone please help me?

Best regards
 

[Nick]

For the new config file, you'll want to update the database settings to be that for your new database. This is probably phpScheduleIt2