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Warning: Undefined array key "fmp_guest" in C:\xampp\htdocs\wp-content\plugins\file-manager-permission-system\views\shortcode\file_manager_view.php on line 21

Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in C:\xampp\htdocs\wp-content\plugins\file-manager-permission-system\views\shortcode\file_manager_view.php:21 Stack trace: #0 C:\xampp\htdocs\wp-content\plugins\file-manager-permission-system\file-manager-permission-system.php(196): include() #1 C:\xampp\htdocs\wp-includes\shortcodes.php(355): FileManagerPro->file_manager_view('', '', 'file_manager') #2 [internal function]: do_shortcode_tag(Array) #3 C:\xampp\htdocs\wp-includes\shortcodes.php(227): preg_replace_callback('/\\[(\\[?)(file_m...', 'do_shortcode_ta...', '[file_manager]\n') #4 C:\xampp\htdocs\wp-includes\class-wp-hook.php(308): do_shortcode('[file_manager]\n') #5 C:\xampp\htdocs\wp-includes\plugin.php(205): WP_Hook->apply_filters('[file_manager]\n', Array) #6 C:\xampp\htdocs\wp-includes\post-template.php(255): apply_filters('the_content', '<!-- wp:shortco...') #7 C:\xampp\htdocs\wp-content\themes\audio-podcast\template-parts\content-page.php(17): the_content() #8 C:\xampp\htdocs\wp-includes\template.php(785): require('C:\\xampp\\htdocs...') #9 C:\xampp\htdocs\wp-includes\template.php(718): load_template('C:\\xampp\\htdocs...', false, Array) #10 C:\xampp\htdocs\wp-includes\general-template.php(204): locate_template(Array, true, false, Array) #11 C:\xampp\htdocs\wp-content\themes\audio-podcast\page.php(39): get_template_part('template-parts/...') #12 C:\xampp\htdocs\wp-includes\template-loader.php(106): include('C:\\xampp\\htdocs...') #13 C:\xampp\htdocs\wp-blog-header.php(19): require_once('C:\\xampp\\htdocs...') #14 C:\xampp\htdocs\index.php(17): require('C:\\xampp\\htdocs...') #15 {main} thrown in C:\xampp\htdocs\wp-content\plugins\file-manager-permission-system\views\shortcode\file_manager_view.php on line 21