Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: cipher-aes128 (user goal)
rejecting: cipher-aes128-0.7.0.1, 0.7, 0.6.4, 0.6.3, 0.6.2, 0.6.1, 0.6, 0.5,
0.4.1, 0.4, 0.3.2.1, 0.3.2, 0.3.1, 0.3, 0.2.5, 0.2.4, 0.2.3, 0.2.2 (global
constraint requires ==0.2.1)
trying: cipher-aes128-0.2.1
next goal: base (dependency of cipher-aes128-0.2.1)
rejecting: base-4.8.1.0/installed-4f7... (conflict: cipher-aes128 => base<0)
rejecting: base-4.8.1.0, 4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0,
4.5.1.0, 4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1,
4.2.0.0, 4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires
installed instance)
Dependency tree exhaustively searched.