Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: yesod-platform (user goal)
rejecting: yesod-platform-1.2.13.3, yesod-platform-1.2.13.2,
yesod-platform-1.2.13.1, yesod-platform-1.2.13, yesod-platform-1.2.12.4
(constraint from user target requires ==1.2.12.3)
trying: yesod-platform-1.2.12.3
trying: vector-0.11.0.0 (dependency of scientific-0.3.4.9)
next goal: yesod-routes (dependency of yesod-platform-1.2.12.3)
rejecting: yesod-routes-1.2.0.7 (conflict: yesod-platform =>
yesod-routes==1.2.0.6)
rejecting: yesod-routes-1.2.0.6 (conflict: vector==0.11.0.0, yesod-routes =>
vector>=0.8 && <0.11)
rejecting: yesod-routes-1.2.0.5, yesod-routes-1.2.0.4, yesod-routes-1.2.0.3,
yesod-routes-1.2.0.2, yesod-routes-1.2.0.1, yesod-routes-1.2.0,
yesod-routes-1.1.2, yesod-routes-1.1.1.1, yesod-routes-1.1.1,
yesod-routes-1.1.0.2, yesod-routes-1.1.0.1, yesod-routes-1.1.0,
yesod-routes-1.0.1.2, yesod-routes-1.0.1.1, yesod-routes-1.0.1,
yesod-routes-1.0.0, yesod-routes-0.0.1 (conflict: yesod-platform =>
yesod-routes==1.2.0.6)
Backjump limit reached (currently 2000, change with --max-backjumps or try to
run with --reorder-goals).