Fatal error: Uncaught Error: Call to undefined function WPDeveloper\BetterDocs\Admin\Customizer\wp_is_block_theme() in /wp-content/plugins/betterdocs/includes/Admin/Customizer/Customizer.php:43 Stack trace: #0 /wp-content/plugins/betterdocs/includes/Dependencies/DI/Definition/Resolver/ObjectCreator.php(146): WPDeveloper\BetterDocs\Admin\Customizer\Customizer->__construct(Object(WPDeveloper\BetterDocs\Admin\Customizer\Defaults)) #1 /wp-content/plugins/betterdocs/includes/Dependencies/DI/Definition/Resolver/ObjectCreator.php(73): WPDeveloper\BetterDocs\Dependencies\DI\Definition\Resolver\ObjectCreator->createInstance(Object(WPDeveloper\BetterDocs\Dependencies\DI\Definition\ObjectDefinition), Array) #2 /wp-content/plugins/betterdocs/includes/Dependencies/DI/Definition/Resolver/ResolverDispatcher.php(64): WPDeveloper\BetterDocs\Dependencies\DI\Definition\Resolver\ObjectCreator->resolve(Object(WPDeveloper\BetterDocs\Dependencies\DI\Definition\ObjectDefinition), Array) #3 /wp-content/plugins/betterdocs/includes/Dependencies/DI/ in /wp-content/plugins/betterdocs/includes/Admin/Customizer/Customizer.php on line 43