I'm running phabricator from an AWS instance. I'm getting the error
>>> UNRECOVERABLE FATAL ERROR <<<
Call to undefined function _phutil_date_format()
/opt/phabricator/src/view/viewutils.php:49
┻━┻ ︵ ¯\_(ツ)_/¯ ︵ ┻━┻
When I try to browse a repo in diffusion. Any ideas on what's going wrong and how to fix?