Resolving dependencies... cabal: Could not resolve dependencies: trying: haskell-aliyun-0.1.0.0 (user goal) trying: aeson-0.8.1.0 (dependency of haskell-aliyun-0.1.0.0) trying: attoparsec-0.13.0.0 (dependency of aeson-0.8.1.0) next goal: xml2json (dependency of haskell-aliyun-0.1.0.0) rejecting: xml2json-0.2.0.0 (conflict: attoparsec==0.13.0.0, xml2json => attoparsec==0.10.*) rejecting: xml2json-0.1.0.1, 0.1.0.0 (conflict: haskell-aliyun => xml2json>=0.2) Dependency tree exhaustively searched.