Making a Bluetooth keyboard

I am making a Bluetooth keyboard, using Nextion display, verified code check and then I get the error “Compile error of board Adafruit Feather 32 u4” I think this is something I did so I installed a sketch but got the same error .
But can anyone tell me if I did something wrong, or is Ad F 32u4 incompatible?

Without Code it is impossible to help.

There must be an error if compile does not work, also depending on the compiler / program you use.