This is the error in the file. I have reinstalled gsx pro and the fenix but error is still there. Other 320s work fine.
That message is not an error. It just saying since you don't have a custom profile for that airframe, it will use the standard one.
icaoType A320 overriding icao_type_designator A320 from aircraft.cfg
That's not an error either, although GSX cannot possibly know if it's a problem or not. The message says that, since the airplane has a custom ICAO code, GSX will use that, instead of the one from the aircraft.cfg. In that case, they are both correct and identical.
So, it seems the only issue is the ICAO code in you flightplan on Simbrief is not A320.