Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: yesod-mangopay (user goal)
rejecting: yesod-mangopay-1.11, 1.10, 1.9.2, 1.9.1, 1.9, 1.7.1, 1.7.0, 1.6,
1.5, 1.4, 1.3, 1.2, 1.1 (global constraint requires ==1.0)
trying: yesod-mangopay-1.0
next goal: wai (dependency of yesod-mangopay-1.0)
rejecting: wai-3.0.2.3, 3.0.2.2, 3.0.2.1, 3.0.2, 3.0.1.1, 3.0.1, 3.0.0.2,
3.0.0.1, 3.0.0, 2.1.0.3, 2.1.0.2, 2.1.0.1, 2.1.0 (conflict: yesod-mangopay =>
wai>=2.0 && <2.1)
trying: wai-2.0.0
trying: transformers-0.3.0.0/installed-16a... (dependency of wai-2.0.0)
trying: monad-logger-0.3.13.1 (dependency of yesod-mangopay-1.0)
trying: transformers-compat-0.4.0.4 (dependency of monad-logger-0.3.13.1)
trying: transformers-compat-0.4.0.4:-two
rejecting: transformers-compat-0.4.0.4:-three (conflict:
transformers==0.3.0.0/installed-16a..., transformers-compat-0.4.0.4:three =>
transformers>=0.4.1 && <0.5)
rejecting: transformers-compat-0.4.0.4:+three (manual flag can only be changed
explicitly)
Dependency tree exhaustively searched.