Hi,
I have experienced this issue at YMML (Melbourne, Australia), thus at a non UK airport which is the reason for my post.
It is repeatable, I can't depart YMML using the automation of the A320 without the Coutl error. Notwithstanding, I can depart other airports i.e. YMHB (Hobart, Australia) and there is no issue.
The common denominator perhaps seems to be the FS Labs A320.
This post is for information gathering, I can manually work my way around it by not requesting any boarding through the airplane or through the menu.
couatl v4.0 (build 4642)
panic log started on Sun Aug 7 16:46:02 2022
problem raised by addon <unknown>
Traceback (most recent call last):
File ".\common\fsm.py", line 73, in executeDoFuncToCompletion
File ".\GSX\assistanceServices\__init__.py", line 1737, in do
File ".\GSX\assistanceServices\__init__.py", line 873, in startEmitters
File ".\GSX\assistanceServices\__init__.py", line 900, in startPassengersEmitters
File ".\common\audioManager.py", line 184, in crossFade
RuntimeError: No more sources available
{'Airport': 'YMML', 'Requested assistance services at': 'Gate G 42', 'User Pos': (-37.67611722601192, 144.84848467009127, 136.671 m, 4.39037 m, 351.52002431508475, 0.0008090007468126714, -0.0, 0.0, 4.572, 1.0)}
Can I also say that your theory does seem to make sense, as I can tell it is going to happen as the noises sound like a thousand passengers are running through the aircraft at high speed.
Kind regards,
Mark