i DID migrate the websites, mailboxes etc from the previous ispconfig system.
Ok, that explains the problem. I guess you accidently overwrote the doctype table on the new server with the content of the old database.
When you migrate a server, 3 tables may not be overwritten:
as they contain data that is specic to this server or to the ispconfig version.
To fix this, download ispconfig 2.2.25 again and run the setup script to update ISPConfig.