I have a bunch of daemons failing... the error message is as follows:
```
Executing task 18829015 (PhabricatorApplicationTransactionPublishWorker)...[2015-08-04 12:24:17] EXCEPTION: (Exception) Diff "PHID-DIFF-qr2rcjd2lparj2atn2m6" does not exist! at [<phabricator>/src/applications/differential/editor/DifferentialTransactionEditor.php:1535]
arcanist(head=master, ref.master=0d6f3328a08f), phabricator(head=master, ref.master=4139305f73f0, custom=1), phlab(head=master, ref.master=c090c8485be5), phutil(head=master, ref.master=aa6cd8f7e5e5)
#0 DifferentialTransactionEditor::requireDiff(string, boolean) called at [<phabricator>/src/applications/differential/editor/DifferentialTransactionEditor.php:1243]
#1 DifferentialTransactionEditor::buildMailBody(DifferentialRevision, array) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:2326]
#2 PhabricatorApplicationTransactionEditor::buildMailForTarget(DifferentialRevision, array, PhabricatorMailTarget) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:2285]
#3 PhabricatorApplicationTransactionEditor::buildMail(DifferentialRevision, array) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:1046]
#4 PhabricatorApplicationTransactionEditor::publishTransactions(DifferentialRevision, array) called at [<phabricator>/src/applications/transactions/worker/PhabricatorApplicationTransactionPublishWorker.php:21]
#5 PhabricatorApplicationTransactionPublishWorker::doWork() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorWorker.php:91]
#6 PhabricatorWorker::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/storage/PhabricatorWorkerActiveTask.php:162]
#7 PhabricatorWorkerActiveTask::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/management/PhabricatorWorkerManagementExecuteWorkflow.php:51]
#8 PhabricatorWorkerManagementExecuteWorkflow::execute(PhutilArgumentParser) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:406]
#9 PhutilArgumentParser::parseWorkflowsFull(array) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:301]
#10 PhutilArgumentParser::parseWorkflows(array) called at [<phabricator>/scripts/setup/manage_worker.php:21]
``