Hey there,
I am currently struggling with GSX at JFK in FSX. After selecting the handling operator, and I can take any, then the error as shown in the error text below comes up.
I have run the Live Updater multiple times, I have checked if any personal airport configuration is installed in Virtuali/GSX but I can't find an answer. I have now also tested GSX with my personally created LTAI/AYT profile and there are absolutely no issues so it is an issue with KJFK V2.
The problem is only the parking system. I was able to use the Jetways, Refuel, Catering, Boarding/Deboarding, Pushback and so on.
I hope y'all can help me with this.