
Originally Posted by
florian_fr40
Hello
You got this error because there is an old/invalid clientID in the Query Admin group (that's mean this client ID is like a ghost).
You have to check your database, to find which clientID, in the group_server_to_client is linked to the Query admin group.
ClientID present in the group_server_to_client table but not in the client table
(Don't forget to make backup)
If you are not familar with the sql, send me in a private message your database.
Do you change something directly in the database ?
Do you remember what you did before to get this error ?