Remove events-calendar-category-colors plugin

debbiebev, if you could set the following in your wp-config.php file, define ( WP_DEBUG, true ) it would help to know the error. What is the URL of your site?

To deactivate the plugin from outside of wordpress, FTP to your account, and rename or remove the plugin folder from the plugins directory.

FWIW, this plugin doesn’t have much interaction with the database other than setting and retrieving options.

Please refer to the following article to deactivate plugins via phpmyadmin.

https://perishablepress.com/quickly-disable-or-enable-all-wordpress-plugins-via-the-database/

As there has been no activity in this thread for a month I am marking it as resolved.