Vt calais serier 1 v6 auto trans problem

hey guys im having problems with my gear box all of a sudden it will only engage reverse resently changed the radiator an all have checked the oil in the box its fine an the only error code coming up is 63 i need help :S

 

yeah mate i checked it when the car was hot an it was at the right level im full confused its my mums car an doesnt even get driven hard

 

also if i put it down to first it seems like it wants to engage like feels as tho you just put it into drive with your foot on the brake
Very confused dont wanna stuff around with stuff if i just have to put a new box in very stumped

 

lol 85* Transmission Slipping
Possible Mechanical Fault