Resolving dependencies... cabal: Could not resolve dependencies: next goal: yesod-core (user goal) rejecting: yesod-core-1.4.30, yesod-core-1.4.29, yesod-core-1.4.28, yesod-core-1.4.27, yesod-core-1.4.26, yesod-core-1.4.25, yesod-core-1.4.24, yesod-core-1.4.23.1, yesod-core-1.4.23, yesod-core-1.4.22, yesod-core-1.4.21, yesod-core-1.4.20.2, yesod-core-1.4.20.1, yesod-core-1.4.20, yesod-core-1.4.19, yesod-core-1.4.18.2, yesod-core-1.4.18.1, yesod-core-1.4.18, yesod-core-1.4.17, yesod-core-1.4.16, yesod-core-1.4.15.1, yesod-core-1.4.15, yesod-core-1.4.14, yesod-core-1.4.13, yesod-core-1.4.12, yesod-core-1.4.11.1, yesod-core-1.4.11, yesod-core-1.4.10, yesod-core-1.4.9.1, yesod-core-1.4.9, yesod-core-1.4.8.3, yesod-core-1.4.8.2, yesod-core-1.4.8.1, yesod-core-1.4.8, yesod-core-1.4.7.3, yesod-core-1.4.7.2, yesod-core-1.4.7.1, yesod-core-1.4.7, yesod-core-1.4.6.2, yesod-core-1.4.6.1, yesod-core-1.4.6, yesod-core-1.4.5, yesod-core-1.4.4.5, yesod-core-1.4.4.4, yesod-core-1.4.4.3, yesod-core-1.4.4.2, yesod-core-1.4.4.1, yesod-core-1.4.4, yesod-core-1.4.3.1, yesod-core-1.4.3, yesod-core-1.4.2, yesod-core-1.4.1.1, yesod-core-1.4.1, yesod-core-1.4.0.2, yesod-core-1.4.0.1, yesod-core-1.4.0, yesod-core-1.2.20.1, yesod-core-1.2.20, yesod-core-1.2.19.2, yesod-core-1.2.19.1, yesod-core-1.2.19, yesod-core-1.2.18, yesod-core-1.2.17, yesod-core-1.2.16.1, yesod-core-1.2.16, yesod-core-1.2.15.2, yesod-core-1.2.15.1, yesod-core-1.2.15, yesod-core-1.2.14, yesod-core-1.2.13.1, yesod-core-1.2.13, yesod-core-1.2.12, yesod-core-1.2.11.1, yesod-core-1.2.11, yesod-core-1.2.10, yesod-core-1.2.9.2, yesod-core-1.2.9.1, yesod-core-1.2.9, yesod-core-1.2.8, yesod-core-1.2.7, yesod-core-1.2.6.7, yesod-core-1.2.6.6, yesod-core-1.2.6.5, yesod-core-1.2.6.4, yesod-core-1.2.6.3, yesod-core-1.2.6.2, yesod-core-1.2.6.1, yesod-core-1.2.6, yesod-core-1.2.5, yesod-core-1.2.4.5, yesod-core-1.2.4.4, yesod-core-1.2.4.3, yesod-core-1.2.4.2, yesod-core-1.2.4.1, yesod-core-1.2.4, yesod-core-1.2.3, yesod-core-1.2.2, yesod-core-1.2.1, yesod-core-1.2.0.4, yesod-core-1.2.0.3, yesod-core-1.2.0.2, yesod-core-1.2.0.1, yesod-core-1.2.0, yesod-core-1.1.8.3, yesod-core-1.1.8.2, yesod-core-1.1.8.1, yesod-core-1.1.8, yesod-core-1.1.7.2, yesod-core-1.1.7.1, yesod-core-1.1.7, yesod-core-1.1.6.1, yesod-core-1.1.6, yesod-core-1.1.5, yesod-core-1.1.4.2, yesod-core-1.1.4.1, yesod-core-1.1.4, yesod-core-1.1.3.1, yesod-core-1.1.3, yesod-core-1.1.2.2, yesod-core-1.1.2.1, yesod-core-1.1.2, yesod-core-1.1.1.2, yesod-core-1.1.1.1, yesod-core-1.1.1, yesod-core-1.1.0.1, yesod-core-1.1.0, yesod-core-1.0.1.3, yesod-core-1.0.1.2, yesod-core-1.0.1.1, yesod-core-1.0.1, yesod-core-1.0.0.2, yesod-core-1.0.0.1 (constraint from user target requires ==1.0.0) trying: yesod-core-1.0.0 trying: base-4.9.0.0/installed-4.9... (dependency of yesod-core-1.0.0) next goal: lifted-base (dependency of yesod-core-1.0.0) rejecting: lifted-base-0.2.3.8, lifted-base-0.2.3.7, lifted-base-0.2.3.6, lifted-base-0.2.3.5, lifted-base-0.2.3.4, lifted-base-0.2.3.3, lifted-base-0.2.3.2, lifted-base-0.2.3.1, lifted-base-0.2.3.0, lifted-base-0.2.2.2, lifted-base-0.2.2.1, lifted-base-0.2.2.0, lifted-base-0.2.1.2, lifted-base-0.2.1.1, lifted-base-0.2.1.0, lifted-base-0.2.0.5, lifted-base-0.2.0.4, lifted-base-0.2.0.3, lifted-base-0.2.0.2, lifted-base-0.2.0.1, lifted-base-0.2 (conflict: yesod-core => lifted-base>=0.1 && <0.2) rejecting: lifted-base-0.1.2, lifted-base-0.1.1.1 (conflict: base==4.9.0.0/installed-4.9..., lifted-base => base>=3 && <4.7) rejecting: lifted-base-0.1.1, lifted-base-0.1.0.4, lifted-base-0.1.0.3, lifted-base-0.1.0.2 (conflict: base==4.9.0.0/installed-4.9..., lifted-base => base>=3 && <4.6) rejecting: lifted-base-0.1.0.1, lifted-base-0.1 (conflict: base==4.9.0.0/installed-4.9..., lifted-base => base>=3 && <4.5) Dependency tree exhaustively searched.