Took my site down too… Here’s the specific error in case it is easier to focus on:
PHP Fatal error: require_once(): Failed opening required ‘<snip />/wp-content/plugins/wp-crontrol/vendor/autoload.php’ (include_path=’.:/usr/share/pear/php:/usr/share/php’) in <snip />/wp-content/plugins/wp-crontrol/wp-crontrol.php on line 45