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