```
1 exception 'InvalidArgumentException' with message 'Argument 1 passed to HarbormasterHostArtifact::loadArtifactLease() must be an instance of PhabricatorUser, none given, called in /opt/phabricator/src/applications/harbormaster/step/HarbormasterCommandBuildStepImplementation.php on line 48 and defined' in /opt/libphutil/src/error/PhutilErrorHandler.php:200
2 Stack trace:
3 #0 /opt/phabricator/src/applications/harbormaster/artifact/HarbormasterHostArtifact.php(45): PhutilErrorHandler::handleError(4096, 'Argument 1 pass...', '/opt/phabricato...', 45, Array)
4 #1 /opt/phabricator/src/applications/harbormaster/step/HarbormasterCommandBuildStepImplementation.php(48): HarbormasterHostArtifact->loadArtifactLease()
5 #2 /opt/phabricator/src/applications/harbormaster/worker/HarbormasterTargetWorker.php(62): HarbormasterCommandBuildStepImplementation->execute(Object(HarbormasterBuild), Object(HarbormasterBuildTarget))
6 #3 /opt/phabricator/src/infrastructure/daemon/workers/PhabricatorWorker.php(91): HarbormasterTargetWorker->doWork()
7 #4 /opt/phabricator/src/infrastructure/daemon/workers/storage/PhabricatorWorkerActiveTask.php(162): PhabricatorWorker->executeTask()
8 #5 /opt/phabricator/src/infrastructure/daemon/workers/PhabricatorTaskmasterDaemon.php(22): PhabricatorWorkerActiveTask->executeTask()
9 #6 /opt/libphutil/src/daemon/PhutilDaemon.php(183): PhabricatorTaskmasterDaemon->run()
10 #7 /opt/libphutil/scripts/daemon/exec/exec_daemon.php(125): PhutilDaemon->execute()
11 #8 {main}
```