Resolving dependencies...
cabal: Could not resolve dependencies:
trying: HStringTemplate-0.8.3/installed-e36... (user goal)
trying: MonadCompose-0.8.4.2/installed-5e1... (user goal)
next goal: hOpenPGP (user goal)
rejecting: hOpenPGP-2.4.3, 2.4.2, 2.4.1, 2.4, 2.3, 2.2.1, 2.2, 2.1, 2.0, 1.11,
1.10, 1.9, 1.8, 1.7, 1.6, 1.5.2, 1.5.1, 1.5, 1.4, 1.3, 1.2.1, 1.2, 1.1, 1.0.2,
1.0.1 (global constraint requires ==1.0)
trying: hOpenPGP-1.0
next goal: conduit (dependency of hOpenPGP-1.0)
rejecting: conduit-1.2.6.1, 1.2.6, 1.2.5.1, 1.2.5, 1.2.4.3, 1.2.4.2, 1.2.4.1,
1.2.4, 1.2.3.1, 1.2.3, 1.2.2.2, 1.2.2.1, 1.2.2, 1.2.1, 1.2.0.2, 1.2.0.1,
1.2.0, 1.1.7, 1.1.6, 1.1.5, 1.1.4, 1.1.3, 1.1.2.1, 1.1.2, 1.1.1.1, 1.1.1,
1.1.0.2, 1.1.0.1, 1.1.0 (conflict: hOpenPGP => conduit>=0.5 && <1.1)
rejecting: conduit-1.0.17.1, 1.0.17, 1.0.16, 1.0.15.1, 1.0.15, 1.0.14,
1.0.13.1, 1.0.13, 1.0.12, 1.0.11.1, 1.0.11, 1.0.10.1, 1.0.10, 1.0.9.3,
1.0.9.2, 1.0.9.1, 1.0.9, 1.0.8, 1.0.7.4, 1.0.7.3, 1.0.7.2, 1.0.7.1, 1.0.7,
1.0.6, 1.0.5.1, 1.0.5, 1.0.4.2, 1.0.4.1, 1.0.4, 1.0.3, 1.0.2, 1.0.1, 1.0.0.2,
1.0.0.1, 1.0.0, 0.5.6, 0.5.5, 0.5.4.2, 0.5.4.1, 0.5.4, 0.5.3, 0.5.2.7,
0.5.2.6, 0.5.2.5, 0.5.2.4 (conflict: MonadCompose =>
transformers==0.4.2.0/installed-814..., conduit => transformers>=0.2.2 &&
<0.4)
rejecting: conduit-0.5.2.3, 0.5.2.2, 0.5.2.1, 0.5.2, 0.5.1, 0.5.0 (conflict:
HStringTemplate => base==4.8.2.0/installed-0d6..., conduit => base>=4.3 &&
<4.6)
rejecting: conduit-0.4.2, 0.4.1.1, 0.4.1, 0.4.0.1, 0.4.0, 0.3.0, 0.2.2, 0.2.1,
0.2.0, 0.1.1.1, 0.1.1, 0.1.0, 0.0.4, 0.0.3, 0.0.2, 0.0.1.1, 0.0.1, 0.0.0.2,
0.0.0.1, 0.0.0 (conflict: hOpenPGP => conduit>=0.5 && <1.1)
Backjump limit reached (change with --max-backjumps).

Note: when using a sandbox, all packages are required to have consistent
dependencies. Try reinstalling/unregistering the offending packages or
recreating the sandbox.