Hello

Thanks for info … and sorry for late reply from me

you can find the calendar in the dashboard under Booking

The problem is still there. I was hoping for the theme update.
Here are a few screeenshots

Appointment overview
Appointment details
Event details date time
Appointment Change the time as an example
Error message when saving

The strange thing is that the changes are made anyway.

thanks for your help

Hello
the problem is that if I use the standard theme before WordPress or the storefront theme it works fine …

The manufacturer of the plugin has his help offer .. I send him the question further.

regards Erik

Hello Thank you for message.

The Theme Enfold is up to date.

Also all Plugin and WordPress!

Here is the current error message as desired.

Hello!

Since WordPress 5.2 there is a built-in function that detects when a plugin or theme causes a fatal error on your website, and therefore notifies you with this automated email.

In this case WordPress intercepted an error in your theme “Enfold”.

First check your website (https://divineofbeauty.de/) and check for visible problems. Next, visit the page where the error occurred (https://divineofbeauty.de/wp-admin/post.php) and see if there are any visible issues.

Please contact your hosting company for assistance in further investigation of this issue.

If your website seems to be flawed and you can not access your dashboard as usual, WordPress now has a special “recovery mode”. That way, you can securely log in to your dashboard and do more research.

https://divineofbeauty.de/wp-login.php?action=enter_recovery_mode&rm_token=cczHOAfHeIo4aqOWz22bXL&rm_key=BpbhxhaS8z5EIZoZBiCZm4

To protect your website, this link expires in 1 day. But do not worry: A new link will be sent to you by e-mail if the error recurs after the deadline.

Error Details
==============
An error of type E_ERROR was in line 247 of the file /home/webddqf5k/html/divineofbeauty.de/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/meta-box.class.php caused. Error Message: Uncaught TypeError: Argument 1 passed to MetaBoxBuilder :: handler_wp_insert_post_data () must be of the type array, null given, called in /home/webddqf5k/html/divineofbeauty.com/wp-includes/class-wp-hook.php on line 286 and defined in /home/webddqf5k/html/divineofbeauty.de/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/meta-box.class.php:247
Stack trace:
# 0 /home/webddqf5k/html/divineofbeauty.de/wp-includes/class-wp-hook.php(286): MetaBoxBuilder-> handler_wp_insert_post_data (NULL, Array)
# 1 /home/webddqf5k/html/divineofbeauty.de/wp-includes/plugin.php(208): WP_Hook-> apply_filters (NULL, Array)
# 2 /home/webddqf5k/html/divineofbeauty.de/wp-includes/post.php(3713): apply_filters (‘wp_insert_post _…’, Array, Array)
# 3 /home/webddqf5k/html/divineofbeauty.de/wp-includes/post.php(4028): wp_insert_post (Array, false)
# 4 /home/webddqf5k/html/divineofbeauty.de/wp-admin/includes/post.php(405): wp_update_post (Array)
# 5 /home/webddqf5k/html/divineofbeauty.de/wp-admin/post.php(218): edit_post ()
# 6 {may