Resolving dependencies... Error: cabal: Could not resolve dependencies: [__0] next goal: pms-domain-model (user goal) [__0] rejecting: pms-domain-model-0.0.5.0 (unsupported spec-version 3.12) [__0] rejecting: pms-domain-model-0.0.4.0, pms-domain-model-0.0.3.0, pms-domain-model-0.0.2.0, pms-domain-model-0.0.1.1, pms-domain-model-0.0.1.0 (constraint from user target requires ==0.0.5.0) [__0] fail (backjumping, conflict set: pms-domain-model) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: pms-domain-model