Fatal error: Uncaught Error: Call to undefined function WP_Filesystem_Base() in /home/badaoud/public_html/wp-content/plugins/mstore-api/wp-templater/src/Templater.php:393 Stack trace: #0 /home/badaoud/public_html/wp-includes/class-wp-hook.php(287): Templater->view_template('/home/badaoud/p...') #1 /home/badaoud/public_html/wp-includes/plugin.php(206): WP_Hook->apply_filters('/home/badaoud/p...', Array) #2 /home/badaoud/public_html/wp-includes/template-loader.php(104): apply_filters('template_includ...', '/home/badaoud/p...') #3 /home/badaoud/public_html/wp-blog-header.php(19): require_once('/home/badaoud/p...') #4 /home/badaoud/public_html/index.php(17): require('/home/badaoud/p...') #5 {main} thrown in /home/badaoud/public_html/wp-content/plugins/mstore-api/wp-templater/src/Templater.php on line 393