Resolving dependencies... cabal: Could not resolve dependencies: trying: prove-everywhere-server-0.1.1 (user goal) trying: base-4.9.0.0/installed-4.9... (dependency of prove-everywhere-server-0.1.1) next goal: time (dependency of prove-everywhere-server-0.1.1) rejecting: time-1.6.0.1/installed-1.6..., time-1.7, time-1.6.0.1, time-1.6 (conflict: prove-everywhere-server => time>=1.4 && <1.6) trying: time-1.5.0.1 trying: scientific-0.3.4.9 (dependency of parsers-0.12.4) next goal: aeson (dependency of prove-everywhere-server-0.1.1) rejecting: aeson-1.0.2.1, aeson-1.0.2.0, aeson-1.0.1.0, aeson-1.0.0.0, aeson-0.11.2.1, aeson-0.11.2.0, aeson-0.11.1.4, aeson-0.11.1.3, aeson-0.11.1.2, aeson-0.11.1.1, aeson-0.11.1.0, aeson-0.11.0.0, aeson-0.9.0.1, aeson-0.9.0.0 (conflict: prove-everywhere-server => aeson>=0.7 && <0.9) rejecting: aeson-0.8.1.1, aeson-0.8.1.0, aeson-0.8.0.2 (conflict: base==4.9.0.0/installed-4.9..., aeson => base>=4.5 && <4.9) rejecting: aeson-0.7.0.6 (conflict: time==1.5.0.1, aeson => time<1.5) rejecting: aeson-0.7.0.4 (conflict: scientific==0.3.4.9, aeson => scientific>=0.2 && <0.3) rejecting: aeson-0.6.2.1, aeson-0.6.2.0, aeson-0.6.1.0, aeson-0.6.0.2, aeson-0.6.0.1, aeson-0.6.0.0, aeson-0.5.0.0, aeson-0.4.0.1, aeson-0.4.0.0, aeson-0.3.2.14, aeson-0.3.2.13, aeson-0.3.2.12, aeson-0.3.2.11, aeson-0.3.2.10, aeson-0.3.2.9, aeson-0.3.2.8, aeson-0.3.2.7, aeson-0.3.2.6, aeson-0.3.2.5, aeson-0.3.2.4, aeson-0.3.2.3, aeson-0.3.2.2, aeson-0.3.2.1, aeson-0.3.2.0, aeson-0.3.1.1, aeson-0.3.1.0, aeson-0.3.0.0, aeson-0.2.0.0, aeson-0.1.0.0, aeson-0.10.0.0 (conflict: prove-everywhere-server => aeson>=0.7 && <0.9) rejecting: aeson-0.8.0.1 (conflict: base==4.9.0.0/installed-4.9..., aeson => base>=4.5 && <4.9) rejecting: aeson-0.8.0.0, aeson-0.7.0.5, aeson-0.7.0.3, aeson-0.7.0.2, aeson-0.7.0.1, aeson-0.7.0.0 (conflict: time==1.5.0.1, aeson => time<1.5) Backjump limit reached (currently 2000, change with --max-backjumps or try to run with --reorder-goals).