Strange Error in Co-Domains page

[vaio1]

Hi guys when I try to edit as administrator the co-domains and I get a message like this:

You do not have privileges to read or enter it.

Why!?

[till]

This is most likely caused by a corrupted database entry. You should try to delete this co-domain and then readd it.

[vaio1]

Hi Till,

the problem persists. Have I delete it directly from the DB using phpmyadmin?

Regards