Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class Druckportal_Frontend does not have a method "inject_campaign_content" in /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/class-wp-hook.php:341 Stack trace: #0 /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/plugin.php(205): WP_Hook->apply_filters('[druckportal_ca...', Array) #1 /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/blocks/post-content.php(50): apply_filters('the_content', '<!-- wp:shortco...') #2 /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/class-wp-block.php(599): render_block_core_post_content(Array, '<!-- wp:shortco...', Object(WP_Block)) #3 /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/class-wp-block.php(579): WP_Block->render() #4 /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/blocks.php(2383): WP_Block->render() #5 /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/blocks.php(2466): render_block(Array) #6 /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/block-template.php(291): do_blocks('<!-- wp:templat...') #7 /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/template-canvas.php(12): get_the_block_template_html() #8 /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/template-loader.php(125): include('/www/htdocs/w01...') #9 /www/htdocs/w014e569/01_Homepages/casamoda/wp-blog-header.php(19): require_once('/www/htdocs/w01...') #10 /www/htdocs/w014e569/01_Homepages/casamoda/index.php(17): require('/www/htdocs/w01...') #11 {main} thrown in /www/htdocs/w014e569/01_Homepages/casamoda/wp-includes/class-wp-hook.php on line 341