Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function “pll_custom_flag” not found or invalid function name in /var/www/brc-solar.de/public_html/wp-includes/class-wp-hook.php:308 Stack trace: #0 /var/www/brc-solar.de/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters() #1 /var/www/brc-solar.de/public_html/wp-content/plugins/polylang/include/language.php(320): apply_filters() #2 /var/www/brc-solar.de/public_html/wp-content/plugins/polylang/include/links-model.php(184): PLL_Language->set_flag() #3 /var/www/brc-solar.de/public_html/wp-includes/class-wp-hook.php(310): PLL_Links_Model->pll_languages_list() #4 /var/www/brc-solar.de/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters() #5 /var/www/brc-solar.de/public_html/wp-content/plugins/polylang/include/model.php(133): apply_filters() #6 /var/www/brc-solar.de/public_html/wp-content/plugins/polylang/include/translated-object.php(570): PLL_Model->get_languages_list() #7 /var/www/brc-solar.de/public_html/wp-content/plugins/polylang/include/translated-object.php(354): PLL_Translated_Object->validate_translations() #8 /var/www/brc-solar.de/public_html/wp-content/plugins/polylang/modules/sync/sync-tax.php(175): PLL_Translated_Object->get_translations() #9 /var/www/brc-solar.de/public_html/wp-includes/class-wp-hook.php(310): PLL_Sync_Tax->set_object_terms() #10 /var/www/brc-solar.de/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #11 /var/www/brc-solar.de/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #12 /var/www/brc-solar.de/public_html/wp-includes/taxonomy.php(2879): do_action() #13 /var/www/brc-solar.de/public_html/wp-includes/post.php(5261): wp_set_object_terms() #14 /var/www/brc-solar.de/public_html/wp-content/plugins/polylang/include/translated-post.php(63): wp_set_post_terms() #15 /var/www/brc-solar.de/public_html/wp-content/plugins/polylang/include/crud-posts.php(77): PLL_Translated_Post->set_language() #16 /var/www/brc-solar.de/public_html/wp-content/plugins/polylang/include/crud-posts.php(105): PLL_CRUD_Posts->set_default_language() #17 /var/www/brc-solar.de/public_html/wp-includes/class-wp-hook.php(310): PLL_CRUD_Posts->save_post() #18 /var/www/brc-solar.de/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #19 /var/www/brc-solar.de/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #20 /var/www/brc-solar.de/public_html/wp-includes/post.php(4717): do_action() #21 /var/www/brc-solar.de/public_html/wp-admin/includes/post.php(699): wp_insert_post() #22 /var/www/brc-solar.de/public_html/wp-admin/post-new.php(66): get_default_post_to_edit() #23 {main} thrown in /var/www/brc-solar.de/public_html/wp-includes/class-wp-hook.php on line 308
