Back end page editor doesn't show the little icons

Hi,

I transferd a website from a subdomain to my clients domain. I have done this before with no problems at all.

But this time I had some weird css problems with de WordPress back end panel but I fixed that. Now the little icons in the page editor of Enfold don’t show up. Still clickable but cant see them.

Also got an error when using EWWW Image optimizer and trying to save the resize options. WordPress itself says its a critical error but I also got this one in my mail, it is in dutch:

Een fout van het type E_ERROR werd veroorzaakt op regelnummer 310 van het bestand /var/www/vhosts/fitvannature.nl/httpdocs/wp-content/themes/enfold/framework/php/class-responsive-images.php. Foutmelding: Uncaught ArgumentCountError: Too few arguments to function av_responsive_images::handler_wp_jpeg_quality(), 1 passed in /var/www/vhosts/fitvannature.nl/httpdocs/wp-includes/class-wp-hook.php on line 287 and exactly 2 expected in /var/www/vhosts/fitvannature.nl/httpdocs/wp-content/themes/enfold/framework/php/class-responsive-images.php:310
Stack trace:
#0 /var/www/vhosts/fitvannature.nl/httpdocs/wp-includes/class-wp-hook.php(287): av_responsive_images->handler_wp_jpeg_quality(82)
#1 /var/www/vhosts/fitvannature.nl/httpdocs/wp-includes/plugin.php(206): WP_Hook->apply_filters(82, Array)
#2 /var/www/vhosts/fitvannature.nl/httpdocs/wp-content/plugins/ewww-image-optimizer/classes/class-ewwwio-tracking.php(140): apply_filters(‘jpeg_quality’, 82)
#3 /var/www/vhosts/fitvannature.nl/httpdocs/wp-content/plugins/ewww-image-optimizer/classes/class-ewwwio-tracking.php(201): EWWWIO_Tracking->setup_data()
#4 /var/www/vhosts/fitvannature.nl/httpdocs/wp-includes/class-wp-hook.php(287): EWWWIO_Tracking->send_checkin()
#5 /var/w

Don’t know if this is part of the problem. I disabled it and deleted the plugin but it didn’t change anything. Also on other clients websites and my own I do not run in to this problem

How can I fix this? maybe there is a file broken? I can’t figure it out.

Hope someone can help me with this.

Kind regards,
Klaas