cabal: cannot configure explicit-exception-0.1.5. It requires transformers ==0.2.* For the dependency on transformers ==0.2.* there are these packages: transformers-0.2.0.0, transformers-0.2.1.0 and transformers-0.2.2.0. However none of them are available. transformers-0.2.0.0 was excluded because mohws-0.2.0.1 requires transformers >=0.1.3 && <0.2 transformers-0.2.1.0 was excluded because mohws-0.2.0.1 requires transformers >=0.1.3 && <0.2 transformers-0.2.2.0 was excluded because mohws-0.2.0.1 requires transformers >=0.1.3 && <0.2