4.20. Did you change the UE_4.20 in the path as well? That may be the reason if you are trying to use the 4.20 UBT to build the 4.19 project c++ data.
4.20. Did you change the UE_4.20 in the path as well? That may be the reason if you are trying to use the 4.20 UBT to build the 4.19 project c++ data.