Fatal Error after Clicking on Theme Customize

Hi All,

today I discovered casually a fatal error by clicking on Appearance > Themes> Enfold Child > Customize.

The error is:

Fatal error: Uncaught Error: Call to undefined function gutenberg_can_edit_post_type() in /home/oleariaf/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php:517 Stack trace: #0 /home/oleariaf/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(377): Avia_Gutenberg->can_use_block_editor(‘post’, true) #1 /home/oleariaf/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(412): Avia_Gutenberg->init_force_classic_post_types() #2 /home/oleariaf/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(487): Avia_Gutenberg->get_force_classic_post_types() #3 /home/oleariaf/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php(615): Avia_Gutenberg->force_classic_editor(‘page’) #4 /home/oleariaf/public_html/wp-includes/class-wp-hook.php(287): Avia_Gutenberg->handler_display_post_states(Array, Object(WP_Post)) #5 /home/oleariaf/public_html/wp-includes/plugin.php(206): WP_Hook->apply_filters(Array, Array) #6 in /home/oleariaf/public_html/wp-content/themes/enfold/config-gutenberg/class-avia-gutenberg.php on line 517>

The WordPress version is 5.5.3, it was updated automatically on 31 Oct. I have Enfold child theme. Checking on Appearance > Themes. “Theme details” on Enfold parent theme the version reported is 4.5.2.

Is it the right way to check the parent theme version installed?

I know that the latest Enfold version available is 4.7.6.4. Maybe could it be this the reason of the problem?

What is your advise to solve my issue?
If I have to install the latest version, what is the safer method to do it?

Thank you in advance.