Uncaught Error: usort(): Argument #1 ($array) must be of type array, string given
in /home/bewwtwqa/bewital.de-wordpress/wp-content/themes/hello-theme-child-master/functions.php on line 581

Call stack:

1. usort()
   wp-content/themes/hello-theme-child-master/functions.php:581
2. zielgruppe_shortcode()
   wp-includes/shortcodes.php:434
3. do_shortcode_tag()
4. preg_replace_callback()
   wp-includes/shortcodes.php:273
5. do_shortcode()
   wp-content/plugins/elementor/includes/widgets/shortcode.php:141
6. Elementor\Widget_Shortcode::render()
   wp-content/plugins/elementor/includes/base/controls-stack.php:2374
7. Elementor\Controls_Stack::render_by_mode()
   wp-content/plugins/elementor/includes/base/widget-base.php:636
8. Elementor\Widget_Base::render_content()
   wp-content/plugins/elementor/includes/base/widget-base.php:782
9. Elementor\Widget_Base::print_content()
   wp-content/plugins/elementor/includes/base/element-base.php:514
10. Elementor\Element_Base::print_element()
    wp-content/plugins/elementor/modules/element-cache/module.php:71
11. Elementor\Modules\ElementCache\Module::Elementor\Modules\ElementCache\{closure}()
    wp-includes/shortcodes.php:434
12. do_shortcode_tag()
13. preg_replace_callback()
    wp-includes/shortcodes.php:273
14. do_shortcode()
    wp-content/plugins/elementor/core/base/document.php:1888
15. Elementor\Core\Base\Document::print_elements()
    wp-content/plugins/elementor/core/base/document.php:1221
16. Elementor\Core\Base\Document::print_elements_with_wrapper()
    wp-content/plugins/elementor/includes/frontend.php:1223
17. Elementor\Frontend::get_builder_content()
    wp-content/plugins/elementor/includes/frontend.php:1105
18. Elementor\Frontend::apply_builder_in_content()
    wp-includes/class-wp-hook.php:341
19. WP_Hook::apply_filters()
    wp-includes/plugin.php:205
20. apply_filters()
    wp-includes/post-template.php:256
21. the_content()
    wp-content/themes/hello-elementor/template-parts/single.php:24
22. require('/home/bewwtwqa/bewit...ate-parts/single.php')
    wp-includes/template.php:816
23. load_template()
    wp-includes/template.php:749
24. locate_template()
    wp-includes/general-template.php:206
25. get_template_part()
    wp-content/themes/hello-elementor/index.php:20
26. include('/home/bewwtwqa/bewit...-elementor/index.php')
    wp-includes/template-loader.php:132
27. require_once('/home/bewwtwqa/bewit.../template-loader.php')
    wp-blog-header.php:19
28. require('/home/bewwtwqa/bewit...s/wp-blog-header.php')
    index.php:17