I can't seem to access my Movable Type installation to access my blog. I get a 500 error when attempting access.

I have contacted my host and then found this error:

Argument "Blogroll/Blogroll.pl_blog" isn't numeric in addition (+) at lib/MT/Compat/v3.pm line 557.
Argument "Blogroll/Blogroll.pl_HASH(0x8cfe290)" isn't numeric in addition (+) at lib/MT/Compat/v3.pm line 557.

And they suggested uninstalling the plugin. Since I couldn't login, I deleted all the entire MTBlogroll folder.
I still can't login.

Help?

Running MT4