Ender 5 Pro pro 8bit
It seems that none of the Ender 5 8-Bit builds can be compiled online. I'm desperatly searching for a version to enable the manual mesh-bed-leveling option. There are also no 8-Bit configurations for the Ender 5 Pro in the Marlin Github.
Sadly, if there isn't any details on the board, and there's no sample config in the Marlin Github for that model / board combo, the builder won't work for you.
There is still a lot of missing info on certain combinations of hardware. I don't quite have a solution for that as yet.