This problem happens only at this airport. GSX works fine at all other airport. Can you help identify any solution?
This error indicates the scenery AFCAD has an error, like overlapping nodes, orphaned nodes, unconnected links, unreachable parkings, etc. You might try to fix it using the ADE or AFX "Fault Finder" options, or at least having an idea what's wrong with the AFCAD, and report it to the developers.