Resolving dependencies... cabal: Could not resolve dependencies: next goal: yesod-bin (user goal) rejecting: yesod-bin-1.5.0.1, yesod-bin-1.4.18.7, yesod-bin-1.4.18.6, yesod-bin-1.4.18.5, yesod-bin-1.4.18.4, yesod-bin-1.4.18.3, yesod-bin-1.4.18.2, yesod-bin-1.4.18.1, yesod-bin-1.4.18, yesod-bin-1.4.17.1, yesod-bin-1.4.17, yesod-bin-1.4.16.1, yesod-bin-1.4.16, yesod-bin-1.4.15, yesod-bin-1.4.14, yesod-bin-1.4.13.3, yesod-bin-1.4.13.2, yesod-bin-1.4.13.1, yesod-bin-1.4.13, yesod-bin-1.4.12, yesod-bin-1.4.11, yesod-bin-1.4.10, yesod-bin-1.4.9.2, yesod-bin-1.4.9.1, yesod-bin-1.4.9, yesod-bin-1.4.8, yesod-bin-1.4.7.2, yesod-bin-1.4.7.1, yesod-bin-1.4.7, yesod-bin-1.4.6, yesod-bin-1.4.5.1, yesod-bin-1.4.5, yesod-bin-1.4.4, yesod-bin-1.4.3.11, yesod-bin-1.4.3.10, yesod-bin-1.4.3.9, yesod-bin-1.4.3.7, yesod-bin-1.4.3.6, yesod-bin-1.4.3.5, yesod-bin-1.4.3.4, yesod-bin-1.4.3.3, yesod-bin-1.4.3.2, yesod-bin-1.4.3.1, yesod-bin-1.4.3, yesod-bin-1.4.2, yesod-bin-1.4.1.2, yesod-bin-1.4.1.1, yesod-bin-1.4.1, yesod-bin-1.4.0.9, yesod-bin-1.4.0.8, yesod-bin-1.4.0.7, yesod-bin-1.4.0.6, yesod-bin-1.4.0.5, yesod-bin-1.4.0.4, yesod-bin-1.4.0.3, yesod-bin-1.4.0.2, yesod-bin-1.4.0.1, yesod-bin-1.4.0, yesod-bin-1.2.13, yesod-bin-1.2.12.8, yesod-bin-1.2.12.7, yesod-bin-1.2.12.6, yesod-bin-1.2.12.5, yesod-bin-1.2.12.4, yesod-bin-1.2.12.3, yesod-bin-1.2.12.2, yesod-bin-1.2.12.1, yesod-bin-1.2.12, yesod-bin-1.2.11, yesod-bin-1.2.10.3, yesod-bin-1.2.10.2, yesod-bin-1.2.10.1, yesod-bin-1.2.10, yesod-bin-1.2.9.4, yesod-bin-1.2.9.3, yesod-bin-1.2.9.2, yesod-bin-1.2.9.1, yesod-bin-1.2.9, yesod-bin-1.2.8.1, yesod-bin-1.2.8, yesod-bin-1.2.7.4, yesod-bin-1.2.7.3, yesod-bin-1.2.7.2, yesod-bin-1.2.7.1, yesod-bin-1.2.7, yesod-bin-1.2.6.1, yesod-bin-1.2.6, yesod-bin-1.2.5.8, yesod-bin-1.2.5.7, yesod-bin-1.2.5.6, yesod-bin-1.2.5.5, yesod-bin-1.2.5.4, yesod-bin-1.2.5.3, yesod-bin-1.2.5.2, yesod-bin-1.2.5.1, yesod-bin-1.2.5, yesod-bin-1.2.4.1, yesod-bin-1.2.4, yesod-bin-1.2.3.4, yesod-bin-1.2.3.3, yesod-bin-1.2.3.2, yesod-bin-1.2.3.1, yesod-bin-1.2.3, yesod-bin-1.2.2.1, yesod-bin-1.2.2, yesod-bin-1.2.1, yesod-bin-1.2.0.1, yesod-bin-1.2.0 (constraint from user target requires ==1.5.0) trying: yesod-bin-1.5.0 next goal: base (dependency of yesod-bin-1.5.0) rejecting: base-4.9.0.0/installed-4.9... (conflict: yesod-bin => base<0) rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0, base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable package requires installed instance) Dependency tree exhaustively searched.