Upgrading wordpress core to 4.7.0 or later should fix the issue. The issue stems from the plugin using wp_parse_url with the ‘$component’ parameter, for which support was only added after WP4.7.0. Before commit 124a78f7e65c85038223b7672ed2c3c34334aaac, the plugin used php’s OOTB ‘parse_url’ function, which only required PHP 5.1.2+
Modern Tribe, please either fix this bug, or update your requirements to WP 4.7, it currently states WP 4.5.
Thanks!
Refs:
http://php.net/manual/en/function.parse-url.php
wp_parse_url()
https://github.com/moderntribe/the-events-calendar/commit/124a78f7e65c85038223b7672ed2c3c34334aaac#diff-e5ad0809a1399fb28c50f3775e36ba7eR2392