"Order rejected - reason:The account number is missing or invalid" IB Controller 1.3.8

When I click the "Panic" button in IB Controller, I get the following error:

Shouldn't the IB Controller already know the account number, given that it's connected to the API?

IB Gateway 975.3c
IBC 3.7.5
AmiBroker 6.30.5

Also, I should have mentioned this is a F&F Group paper trading account.

The "panic" button works only when there is a single account. With F&F account you have multiple underlying accounts.

That makes sense. Thanks for letting me know!