Resolving dependencies... cabal: Could not resolve dependencies: trying: arff-0.1.0 (user goal) trying: base-4.7.0.1/installed-e4b... (dependency of arff-0.1.0) next goal: bytestring-lexing (dependency of arff-0.1.0) rejecting: bytestring-lexing-0.4.3.2, 0.4.3.1, 0.4.3, 0.4.2, 0.4.0, 0.3.0, 0.2.1 (conflict: arff => bytestring-lexing==0.2) rejecting: bytestring-lexing-0.2 (conflict: base==4.7.0.1/installed-e4b..., bytestring-lexing => base<0) rejecting: bytestring-lexing-0.1.2, 0.1.0.2, 0.1.0.1, 0.1 (conflict: arff => bytestring-lexing==0.2) Dependency tree exhaustively searched.