I’ve updated to the latest version of WordPress and the ability to create an event has broken. Text box is only white text and no date/schedule options nor locations are enabled.

I get this alert in settings: The site is experiencing technical difficulties. Please check your site admin email inbox for instructions.

I received this email:
Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.

In this case, WordPress caught an error with one of your plugins, EventON.

First, visit your website (http://steinerranchpost.com/) and check for any visible issues. Next, visit the page where the error was caught (http://steinerranchpost.com/wp-admin/post.php?post=228&action=edit) and check for any visible issues.

Please contact your host for assistance with investigating this issue further.

If your site appears broken and you can’t access your dashboard normally, WordPress now has a special “recovery mode”. This lets you safely login to your dashboard and investigate further.

http://steinerranchpost.com/wp-login.php?action=enter_recovery_mode&rm_token=9IhiHNFmiKcD7QN8WurtU9&rm_key=2K5CVWnJQntJsvMAOHvN9n

To keep your site safe, this link will expire in 1 day. Don’t worry about that, though: a new link will be emailed to you if the error occurs again after it expires.

Error Details
=============
An error of type E_ERROR was caused in line 154 of the file /nas/content/live/ranchpost/wp-content/plugins/eventON/includes/admin/post_types/ajde_events_meta_boxes.php. Error message: Uncaught Error: [] operator not supported for strings in /nas/content/live/ranchpost/wp-content/plugins/eventON/includes/admin/post_types/ajde_events_meta_boxes.php:154
Stack trace:
#0 [internal function]: ajde_evcal_show_box_2(Object(WP_Post), Array)
#1 /nas/content/live/ranchpost/wp-admin/includes/template.php(1304): uopz_call_user_func(‘ajde_evcal_show…’, Object(WP_Post), Array)
#2 /nas/content/live/ranchpost/wp-admin/edit-form-advanced.php(635): do_meta_boxes(Object(WP_Screen), ‘side’, Object(WP_Post))
#3 /nas/content/live/ranchpost/wp-admin/post.php(197): include(‘/nas/content/li…’)
#4 {main}
thrown