Issue after WP Core 5.5 update

I have upgraded to WP 5.5.1 today and since then I have an issue that I can no longer see all the Enfold settings. I can only see the very first page of the settings. All the other subpages of settings are gone.

When I first upgraded, I also received an email from WordPress telling me that something went wrong. As my websites standard language is german, I received this mail in german. I am coyping it in here. Hope that helps.

Fehler-Details
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Ein Fehler vom Typ E_ERROR wurde in der Zeile 516 der Datei /nas/content/live/mcprezi2019/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php verursacht. Fehlermeldung: Uncaught Error: Call to undefined function gutenberg_can_edit_post_type() in /nas/content/live/mcprezi2019/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php:516
Stack trace:
#0 /nas/content/live/mcprezi2019/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(376): Avia_Gutenberg->can_use_block_editor(‘post’, true)
#1 /nas/content/live/mcprezi2019/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(411): Avia_Gutenberg->init_force_classic_post_types()
#2 /nas/content/live/mcprezi2019/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(486): Avia_Gutenberg->get_force_classic_post_types()
#3 /nas/content/live/mcprezi2019/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(614): Avia_Gutenberg->force_classic_editor(‘page’)
#4 /nas/content/live/mcprezi2019/wp-includes/class-wp-hook.php(287): Avia_Gutenberg->handler_display_post_states(Array, Object(WP_Post))
#5 /nas/content/live/mcprezi2019/wp-includes/plugin.php(206): WP_Hook->apply_filt