I am getting the following exception when trying to claim a Maniphest task on our install:
```
[12-Jan-2015 10:26:03 Australia/Sydney] [2015-01-12 10:26:03] EXCEPTION: (Exception) Edges are not available for objects of type '????
'! at [<phabricator>/src/infrastructure/edges/constants/PhabricatorEdgeConfig.php:26]
[12-Jan-2015 10:26:03 Australia/Sydney] #0 PhabricatorEdgeConfig::establishConnection(string, string) called at [<phabricator>/src/infrastructure/edges/editor/PhabricatorEdgeEditor.php:302]
[12-Jan-2015 10:26:03 Australia/Sydney] #1 PhabricatorEdgeEditor::executeRemoves() called at [<phabricator>/src/infrastructure/edges/editor/PhabricatorEdgeEditor.php:125]
[12-Jan-2015 10:26:03 Australia/Sydney] #2 PhabricatorEdgeEditor::save() called at [<phabricator>/src/applications/subscriptions/editor/PhabricatorSubscriptionsEditor.php:98]
[12-Jan-2015 10:26:03 Australia/Sydney] #3 PhabricatorSubscriptionsEditor::save() called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:409]
[12-Jan-2015 10:26:03 Australia/Sydney] #4 PhabricatorApplicationTransactionEditor::applyExternalEffects(ManiphestTask, ManiphestTransaction) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:706]
[12-Jan-2015 10:26:03 Australia/Sydney] #5 PhabricatorApplicationTransactionEditor::applyTransactions(ManiphestTask, array) called at [<phabricator>/src/applications/maniphest/controller/ManiphestTransactionSaveController.php:171]
[12-Jan-2015 10:26:03 Australia/Sydney] #6 ManiphestTransactionSaveController::processRequest() called at [<phabricator>/src/aphront/AphrontController.php:33]
[12-Jan-2015 10:26:03 Australia/Sydney] #7 AphrontController::handleRequest(AphrontRequest) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:196]
[12-Jan-2015 10:26:03 Australia/Sydney] #8 AphrontApplicationConfiguration::processRequest(AphrontRequest, PhutilDeferredLog, AphrontPHPHTTPSink) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:121]
[12-Jan-2015 10:26:03 Australia/Sydney] #9 AphrontApplicationConfiguration::runHTTPRequest(AphrontPHPHTTPSink) called at [<phabricator>/webroot/index.php:19]
[12-Jan-2015 10:26:03 Australia/Sydney] [2015-01-12 10:26:03] PHLOG: 'Unable to write to logfile '/mnt/logs/phd/phabricator-access.log'!' at [/usr/src/libphutil/src/filesystem/PhutilDeferredLog.php:189]
[12-Jan-2015 10:26:03 Australia/Sydney] PHP Fatal error: Uncaught exception 'Exception' with message 'Process exited with an open transaction! The transaction will be implicitly rolled back. Calls to openTransaction() must always be paired with a call to saveTransaction() or killTransaction().' in /usr/src/libphutil/src/aphront/storage/connection/AphrontDatabaseTransactionState.php:69
Stack trace:
#0 [internal function]: AphrontDatabaseTransactionState->__destruct()
#1 {main}
thrown in /usr/src/libphutil/src/aphront/storage/connection/AphrontDatabaseTransactionState.php on line 69
```