XF 2.1 InvalidArgumentException: DOMXPath::query(): Invalid expression in selector

[Chris Radford]

InvalidArgumentException: DOMXPath::query(): Invalid expression in selector >> body << in /home/onefootb/public_html/src/vendor/pelago/emogrifier/Classes/Emogrifier.php on line 370 in src/vendor/pelago/emogrifier/Classes/Emogrifier.php at line 1532
[LIST=1]
[*]Pelago\Emogrifier->handleXpathError()
[*]DOMXPath->query() in src/vendor/pelago/emogrifier/Classes/Emogrifier.php at line 370
[*]Pelago\Emogrifier->process() in src/vendor/pelago/emogrifier/Classes/Emogrifier.php at line 289
[*]Pelago\Emogrifier->emogrify() in src/XF/Mail/Styler.php at line 36
[*]XF\Mail\Styler->styleHtml() in src/XF/Mail/Mailer.php at line 189
[*]XF\Mail\Mailer->renderMailTemplate() in src/XF/Mail/Mail.php at line 277
[*]XF\Mail\Mail->renderTemplate() in src/XF/Mail/Mail.php at line 315
[*]XF\Mail\Mail->getSendableMessage() in src/XF/Mail/Mail.php at line 346
[*]XF\Mail\Mail->queue() in src/XF/Service/Conversation/Notifier.php at line 115
[*]XF\Service\Conversation\Notifier->_sendNotifications() in src/XF/Service/Conversation/Notifier.php at line 58
[*]XF\Service\Conversation\Notifier->notifyCreate() in src/XF/Service/Conversation/Creator.php at line 235
[*]XF\Service\Conversation\Creator->sendNotifications() in src/XF/Service/Conversation/Creator.php at line 225
[*]XF\Service\Conversation\Creator->_save() in src/XF/Service/ValidateAndSavableTrait.php at line 40
[*]XF\Service\Conversation\Creator->save() in src/XF/Job/UserMessage.php at line 47
[*]XF\Job\UserMessage->executeAction() in src/XF/Job/AbstractUserCriteriaJob.php at line 59
[*]XF\Job\AbstractUserCriteriaJob->run() in src/XF/Job/Manager.php at line 241
[*]XF\Job\Manager->runJobInternal() in src/XF/Job/Manager.php at line 187
[*]XF\Job\Manager->runJobEntry() in src/XF/Job/Manager.php at line 103
[*]XF\Job\Manager->runByIds() in src/XF/Admin/Controller/Tools.php at line 120
[*]XF\Admin\Controller\Tools->actionRunJob() in src/XF/Mvc/Dispatcher.php at line 249
[*]XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 88
[*]XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 41
[*]XF\Mvc\Dispatcher->run() in src/XF/App.php at line 1891
[*]XF\App->run() in src/XF.php at line 328
[*]XF::runApp() in admin.php at line 13

Hello all! We recently migrated to a brand new server and when we attempt to send Mass Private Message we get the error above.

Seemingly, too, when we tried to send a test email via the mass email option the email does not arrive.

Are we missing some PHP functionality?

Thank you for any all responses!