It’s pretty simple actually. Go to Qualitymenu\HUD_UMG_Classic\UtilWidgets
Then open “WB_Classic_Keybinding_categoryItem”.
Rename the textbox “Category Name” to literally anything else. In my case I called it “Category Name 1”. Then it should compile just fine. That was the only major issue I had with 4.21. It’s still working just fine on 4.22 as well.