Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: api-rpc-accumulate-0.1.0.0 (user goal)
[__1] trying: unordered-containers-0.2.16.0 (dependency of api-rpc-accumulate)
[__2] next goal: remote-json (dependency of api-rpc-accumulate)
[__2] rejecting: remote-json-0.2 (conflict: unordered-containers==0.2.16.0,
remote-json => unordered-containers>=0.2.5 && <0.2.7)
[__2] fail (backjumping, conflict set: api-rpc-accumulate, remote-json,
unordered-containers)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, api-rpc-accumulate, remote-json,
unordered-containers
Try running with --minimize-conflict-set to improve the error message.