Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: yesod-core (user goal)
rejecting: 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 (constraint from
user target requires ==1.4.19)
trying: yesod-core-1.4.19
trying: base-4.9.0.0/installed-4.9... (dependency of yesod-core-1.4.19)
trying: primitive-0.6.2.0 (dependency of yesod-core-1.4.19)
next goal: vector (dependency of yesod-core-1.4.19)
rejecting: vector-0.11.0.0, vector-0.10.12.3 (conflict: primitive==0.6.2.0,
vector => primitive>=0.5.0.1 && <0.6.2)
rejecting: vector-0.10.12.2, vector-0.10.12.1, vector-0.10.11.0,
vector-0.10.10.0, vector-0.10.9.2, vector-0.10.9.1, vector-0.10.9.0 (conflict:
primitive==0.6.2.0, vector => primitive>=0.5.0.1 && <0.6)
rejecting: vector-0.10.0.1, vector-0.10 (conflict:
base==4.9.0.0/installed-4.9..., vector => base>=4 && <4.7)
rejecting: vector-0.9.1, vector-0.9 (conflict: primitive==0.6.2.0, vector =>
primitive>=0.4.0.1 && <0.5)
rejecting: vector-0.8, vector-0.7.1, vector-0.7.0.1, vector-0.7,
vector-0.6.0.2, vector-0.6.0.1, vector-0.6, vector-0.5, vector-0.4.2,
vector-0.4.1, vector-0.4, vector-0.3.1, vector-0.3, vector-0.2, vector-0.1
(conflict: yesod-core => vector>=0.9 && <0.12)
rejecting: vector-0.10.12.0, vector-0.10.9.3 (conflict: primitive==0.6.2.0,
vector => primitive>=0.5.0.1 && <0.6)
Backjump limit reached (currently 2000, change with --max-backjumps or try to
run with --reorder-goals).