My account

Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, class "ER_Shortcode_My_Account" not found in /customers/4/b/c/barabox.be/httpd.www/wp-content/plugins/easyreservations/includes/class-er-shortcodes.php:57 Stack trace: #0 /customers/4/b/c/barabox.be/httpd.www/wp-content/plugins/easyreservations/includes/class-er-shortcodes.php(104): ER_Shortcodes::shortcode_wrapper(Array, '') #1 /customers/4/b/c/barabox.be/httpd.www/wp-includes/shortcodes.php(356): ER_Shortcodes::my_account('', '', 'easy_my_account') #2 [internal function]: do_shortcode_tag(Array) #3 /customers/4/b/c/barabox.be/httpd.www/wp-includes/shortcodes.php(228): preg_replace_callback('/\\[(\\[?)(easy_m...', 'do_shortcode_ta...', '[easy_my_accoun...') #4 /customers/4/b/c/barabox.be/httpd.www/wp-includes/class-wp-hook.php(307): do_shortcode('[easy_my_accoun...') #5 /customers/4/b/c/barabox.be/httpd.www/wp-includes/plugin.php(191): WP_Hook->apply_filters('[easy_my_accoun...', Array) #6 /customers/4/b/c/barabox.be/httpd.www/wp-includes/post-template.php(253): apply_filters('the_content', '