Updating to latest version causes entire site to crash

Hey

I have updated Spectra to the latest version, and this breaks my entire WordPress backend:

There has been a critical error on this website. Please check your site admin email inbox for instructions.

I have also tried to delete Spectra and install it from scratch, but the same issue appears. This is the the error detail in the email WordPress sent after the first update attempt:

An error of type E_ERROR was caused in line 29 of the file [my_server_directory]/wp-content/plugins/ultimate-addons-for-gutenberg/lib/gutenberg-templates/inc/traits/helper.php. Error message: Uncaught Error: Call to undefined function Gutenberg_Templates\Inc\Traits\error_log() in [my_server_directory]/wp-content/plugins/ultimate-addons-for-gutenberg/lib/gutenberg-templates/inc/traits/helper.php:29
Stack trace: 0 [my_server_directory]/wp-content/plugins/ultimate-addons-for-gutenberg/lib/gutenberg-templates/inc/traits/helper.php(334): Gutenberg_Templates\Inc\Traits\Helper->ast_block_templates_log() 1 [my_server_directory]/wp-content/plugins/ultimate-addons-for-gutenberg/lib/gutenberg-templates/inc/importer/sync-library.php(154): Gutenberg_Templates\Inc\Traits\Helper->create_files() 2 [my_server_directory]/wp-content/plugins/ultimate-addons-for-gutenberg/lib/gutenberg-templates/inc/importer/updater.php(142): Gutenberg_Templates\Inc\Importer\Sync_Library->set_default_assets() 3 [my_server_directory]/wp-includes/class-wp-hook.php(324): Gutenberg_Templates\Inc\Importer\Updater->updated() 4 [my_server_directory]/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() 5 [my_server_directory]/wp-includes/plugin.php(517): WP_Hook->do_action() 6 [my_server_directory]/wp-content/plugins/ultimate-addons-for-gutenberg/lib/gutenberg-templates/inc/importer/updater.php(61): do_action() 7 [my_server_directory]/wp-includes/class-wp-hook.php(324): Gutenberg_Templates\Inc\Importer\Updater->init() 8 [my_server_directory]/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() 9 [my_server_directory]/wp-includes/plugin.php(517): WP_Hook->do_action() 10 [my_server_directory]/wp-admin/admin.php(175): do_action() 11 [my_server_directory]/wp-admin/post.php(12): require_once('…') 12 {main}

thrown

Any idea what this could be?

Cheers