Resolving dependencies... cabal: Could not resolve dependencies: next goal: DefendTheKing (user goal) rejecting: DefendTheKing-0.3.1 (constraint from user target requires ==0.3) trying: DefendTheKing-0.3 trying: base-4.9.0.0/installed-4.9... (dependency of DefendTheKing-0.3) next goal: MaybeT (dependency of DefendTheKing-0.3) rejecting: MaybeT-0.1.2, MaybeT-0.1.1 (conflict: base==4.9.0.0/installed-4.9..., MaybeT => base<4.8) rejecting: MaybeT-0.1.0 (conflict: base==4.9.0.0/installed-4.9..., MaybeT => base<4.3) Dependency tree exhaustively searched.