What the...SMF R1 Login Error

[† ÐëepÇuT¹ †]

Please try again. If you come back to this error screen, report the error to an administrator.

Just upgraded my forums from yabbse 1.5 which had a good database full of members. Now when I try to login it gives me that error. Anyone else having this problem?

[[Unknown]]

Are you certain you ran upgrade.php and uploaded all the files?

-[Unknown]

[† ÐëepÇuT¹ †]

Problem fixed. It seems I was uploading a SMF 5.0 beta database to a "Yabbse to SMF RC1" converted forum, my bad. I just installed SMF 1.5 beta then restored the database and then finally upgraded to RC1.