Just upgraded to 1.0rc1 (using MSSQLServer) and I recieved the same error - everything seems to work except the ACP tab was nowhere to be found. I ended up just adding the ACP modules manually - took awhile but everything seems to work there now.

Frist - thanks for a great portal mod - I installed 1st on mssql and appreciated that topic debuging the install.

Now on a new install (mysql) my portal acp was missing - I had renamed the Gallery Tab and didn't realize the portal installs in the same tab... just fyi might happen to someone else...