the error log cannot post here since the size of the log is too big.
The error log clarify the problem:exception TOO_MANY_OBJECTSYou have too high AI settings and/or too detailed airport, so you have exceeded the maximum number of allowed objects in the simulator (currently documented at 1000), this post explains it better and has some suggestion of what you can do in GSX to reduce its own contribution to reaching the limit:https://www.fsdreamteam.com/forum/index.php/topic,30930.msg198089.html#msg198089