xmonad.hs:68:8: error:
    Ambiguous occurrence ‘workspaces’
    It could refer to
       either ‘XMonad.workspaces’,
              imported from ‘XMonad’ at xmonad.hs:2:1-13
              (and originally defined in ‘XMonad.Core’)
           or ‘W.workspaces’,
              imported from ‘XMonad.StackSet’ at xmonad.hs:3:1-27
   |
68 |      , workspaces         = myWorkspaces
   |        ^^^^^^^^^^

Please check the file for errors.
Warning: Missing charsets in String to FontSet conversion