Resolving dependencies...
cabal: Could not resolve dependencies:
trying: base-4.9.0.0/installed-4.9... (dependency of happstack-helpers-0.56)
next goal: happstack-data (dependency of happstack-helpers-0.56)
rejecting: happstack-data-6.0.1, happstack-data-6.0.0 (conflict:
happstack-helpers => happstack-data>=0.3 && <0.6)
trying: happstack-data-0.5.0.3
next goal: template-haskell (dependency of happstack-data-0.5.0.3)
rejecting: template-haskell-2.11.0.0/installed-2.1...,
template-haskell-2.11.0.0, template-haskell-2.10.0.0,
template-haskell-2.9.0.0, template-haskell-2.8.0.0, template-haskell-2.7.0.0
(conflict: happstack-data => template-haskell<2.7)
rejecting: template-haskell-2.6.0.0 (conflict: base==4.9.0.0/installed-4.9...,
template-haskell => base==4.4.*)
rejecting: template-haskell-2.5.0.0 (conflict: base==4.9.0.0/installed-4.9...,
template-haskell => base==4.3.*)
rejecting: template-haskell-2.4.0.1 (conflict: base==4.9.0.0/installed-4.9...,
template-haskell => base==4.2.*)
rejecting: template-haskell-2.4.0.0 (conflict: base==4.9.0.0/installed-4.9...,
template-haskell => base>=3 && <4.3)
rejecting: template-haskell-2.3.0.1, template-haskell-2.3.0.0,
template-haskell-2.2.0.0 (conflict: base==4.9.0.0/installed-4.9...,
template-haskell => base<4.3)
Dependency tree exhaustively searched.