Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "hth_home_title_modifier" not found or invalid function name in /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-hook.php:326 Stack trace: #0 /home/hackthehologram/public_html/technomancer/wp-includes/plugin.php(205): WP_Hook->apply_filters('Hello world!', Array) #1 /home/hackthehologram/public_html/technomancer/wp-includes/post-template.php(174): apply_filters('the_title', 'Hello world!', 1) #2 /home/hackthehologram/public_html/technomancer/wp-includes/blocks/post-title.php(28): get_the_title() #3 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(586): render_block_core_post_title(Array, '', Object(WP_Block)) #4 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(566): WP_Block->render() #5 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(566): WP_Block->render() #6 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(566): WP_Block->render() #7 /home/hackthehologram/public_html/technomancer/wp-includes/blocks/post-template.php(123): WP_Block->render(Array) #8 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(586): render_block_core_post_template(Array, '', Object(WP_Block)) #9 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(566): WP_Block->render() #10 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(566): WP_Block->render() #11 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(566): WP_Block->render() #12 /home/hackthehologram/public_html/technomancer/wp-includes/blocks.php(2359): WP_Block->render() #13 /home/hackthehologram/public_html/technomancer/wp-includes/blocks.php(2431): render_block(Array) #14 /home/hackthehologram/public_html/technomancer/wp-includes/blocks/pattern.php(63): do_blocks('\n<!-- wp:group ...') #15 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(586): render_block_core_pattern(Array, '', Object(WP_Block)) #16 /home/hackthehologram/public_html/technomancer/wp-includes/blocks.php(2359): WP_Block->render() #17 /home/hackthehologram/public_html/technomancer/wp-includes/blocks.php(2431): render_block(Array) #18 /home/hackthehologram/public_html/technomancer/wp-includes/blocks/pattern.php(63): do_blocks('\n<!-- wp:patter...') #19 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(586): render_block_core_pattern(Array, '', Object(WP_Block)) #20 /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-block.php(566): WP_Block->render() #21 /home/hackthehologram/public_html/technomancer/wp-includes/blocks.php(2359): WP_Block->render() #22 /home/hackthehologram/public_html/technomancer/wp-includes/blocks.php(2431): render_block(Array) #23 /home/hackthehologram/public_html/technomancer/wp-includes/block-template.php(294): do_blocks('<!-- wp:templat...') #24 /home/hackthehologram/public_html/technomancer/wp-includes/template-canvas.php(12): get_the_block_template_html() #25 /home/hackthehologram/public_html/technomancer/wp-includes/template-loader.php(106): include('/home/hacktheho...') #26 /home/hackthehologram/public_html/technomancer/wp-blog-header.php(19): require_once('/home/hacktheho...') #27 /home/hackthehologram/public_html/technomancer/index.php(17): require('/home/hacktheho...') #28 {main} thrown in /home/hackthehologram/public_html/technomancer/wp-includes/class-wp-hook.php on line 326