Infiltrators: Do they work?

[PrinceofValyria]

I have a question. I've done some sieges and after establishing checkpoints and sending in infiltrators, a message flashes saying
SCRIPT ERROR ON OPCODE 926: Invalid Overlay ID: 5; LINE NO: 34:
At Presentation prsnt_infiltrationandsabotage trigger no: 0
At Presentation prsnt_infiltrationandsabotage trigger no: 0
SCRIPT ERROR ON OPCODE 925: Invalid Overlay ID: 5; LINE NO: 37:
At Presentation prsnt_infiltrationandsabotage trigger no: 0
At Presentation prsnt_infiltrationandsabotage trigger no: 0

And the infiltration and traitor things don't seem to work. Just FYI.