remote: #0 ExecFuture::resolvex() called at [<phabricator>/src/applications/repository/storage/PhabricatorRepository.php:346]
remote: #1 PhabricatorRepository::execxLocalCommand(string, string, string) called at [<phabricator>/src/applications/diffusion/engine/DiffusionCommitHookEngine.php:968]
remote: #2 DiffusionCommitHookEngine::findMercurialPushKeyRefUpdates() called at [<phabricator>/src/applications/diffusion/engine/DiffusionCommitHookEngine.php:693]
remote: #3 DiffusionCommitHookEngine::findMercurialRefUpdates() called at [<phabricator>/src/applications/diffusion/engine/DiffusionCommitHookEngine.php:222]
remote: #4 DiffusionCommitHookEngine::findRefUpdates() called at [<phabricator>/src/applications/diffusion/engine/DiffusionCommitHookEngine.php:124]
remote: #5 DiffusionCommitHookEngine::execute() called at [<phabricator>/scripts/repository/commit_hook.php:133]
remote: pushkey-abort: prepushkey.phabricator hook exited with status 255
Usage Exception: 'hg push' failed! Fix the error and push this change manually.
[2015-10-13 04:14:43] EXCEPTION: (ArcanistUsageException)'hg push' failed! Fix the error and push this change manually. at [<arcanist>/src/workflow/ArcanistLandWorkflow.php:1083]