Airport cache not valid: got error CreateFile failed: The process cannot access the file because it is being used by another process (system:32)
This error indicates another add-on you are using is trying to access the scenery AFCAD or the FSX scenery cache, so GSX can't access it. Try to disable some add-on modules or executables that might have anything to do with AFCAD files (such as flight planner, AFCAD editors, etc.).
Also, your log shows you are not using the most current version of the Couatl.exe, re-run the GSX installer to get it.