if I remember correctly, not sure 100%, a windows dialog opened telling the usual something like "application has stopped working"
my Couatl.err file indeed looks like a very old log ....
couatl v3.2 (build 3829)
panic log started on Sat Sep 2 10:22:29 2017
problem raised by addon <unknown>
Traceback (most recent call last):
File "couatl\GSX\__init__.py", line 214, in prepareGate
File "couatl\GSX\parkingServices\__init__.py", line 114, in setGate
File "couatl\GSX\parkingServices\followMe.py", line 163, in __init__
File "couatl\GSX\__init__.py", line 926, in findSuitableParking
AssertionError
{'Requested FollowMe to': 'Runway 24 Start', 'Airport': 'PAFB', 'User Pos': (64.83847527271699, -147.6059630702435, 140.876 m, 2.49675 m, 6.450246249764197)}