Character has invalid known spells. ELC

I am having an issue where players are unable to log after getting so far with their character build. Both characters are monk/wizard/arcane archer builds.
The log file shows this error on both characters
[Mon Feb 14 19:05:15] Invalid character - player login refused. Character has invalid known spells. Player Name: LOGNAME Player ID: 1 Character: CHARACTERNAME (XXXXXXXX) () ()
Has anyone else had this issue with ELC enabled?
The log file shows this error on both characters
[Mon Feb 14 19:05:15] Invalid character - player login refused. Character has invalid known spells. Player Name: LOGNAME Player ID: 1 Character: CHARACTERNAME (XXXXXXXX) () ()
Has anyone else had this issue with ELC enabled?
0
Comments
FYI I am not using any edited spell 2da's or hak's.
Get the players to make sure they have clean /development and /override folders.
Edit: Probably not spells but 2da's related to class leveling.
As a server owner, the only real power comes from telling them that it's their fault and they have to fix it (by removing the offending 2da)