Do you know, if this error is caused by phabricator, or by an error at the instance? I didn't change anything in the last days.
[2016-03-23 00:38:46] EXCEPTION: (PhutilProxyException) Permanent failure while executing Task ID 79344. {>} (PhabricatorWorkerPermanentFailureException) Unable to load transactions: PHID-XACT-TASK-3bw4lr3aclfgjzf. at [<phabricator>/src/applications/transactions/worker/PhabricatorApplicationTransactionPublishWorker.php:112] arcanist(), phabricator(head=master, ref.master=1885c4e03bb6), phutil(head=master, ref.master=b4f38af38480) #0 <#2> PhabricatorApplicationTransactionPublishWorker::loadTransactions(ManiphestTask) called at [<phabricator>/src/applications/transactions/worker/PhabricatorApplicationTransactionPublishWorker.php:19] #1 <#2> PhabricatorApplicationTransactionPublishWorker::doWork() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorWorker.php:122] #2 <#2> PhabricatorWorker::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/storage/PhabricatorWorkerActiveTask.php:171] #3 <#2> PhabricatorWorkerActiveTask::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorTaskmasterDaemon.php:22] #4 PhabricatorTaskmasterDaemon::run() called at [<phutil>/src/daemon/PhutilDaemon.php:183] #5 PhutilDaemon::execute() called at [<phutil>/scripts/daemon/exec/exec_daemon.php:125]