by Jamie Kramer.
This is the plugin that seems to be causing the error: https://moodle.org/plugins/auth_mcae called "Autoenrol cohort"
As Emma said you might have an incompatible version of this plugin for your Moodle version. Inside of auth/mcae/version.php check out the plugin version, and compare that to the correct version to run for your Moodle version. You can check compatible versions on the plugin's versions page: https://moodle.org/plugins/pluginversions.php?plugin=auth_mcae