Resolving dependencies...
cabal: Could not resolve dependencies:
trying: hxt-9.3.1.9/installed-611... (user goal)
next goal: hxt-regex-xmlschema (user goal)
rejecting: hxt-regex-xmlschema-9.2.0/installed-87c... (package is broken)
rejecting: hxt-regex-xmlschema-9.2.0, 9.1.0, 9.0.4, 9.0.1, 9.0.0 (conflict:
hxt => hxt-regex-xmlschema==9.2.0/installed-87c...)
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.