Warning: Undefined variable $handler in /home/amensagem.org/public/wp-content/themes/vantage/premium/addons/ajax-comments/ajax-comments.php on line 73

Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, no array or string given in /home/amensagem.org/public/wp-includes/functions.php:3831
Stack trace:
#0 /home/amensagem.org/public/wp-content/plugins/download-monitor/src/DownloadHandler.php(432): wp_die()
#1 /home/amensagem.org/public/wp-includes/class-wp-hook.php(324): DLM_Download_Handler->handler()
#2 /home/amensagem.org/public/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#3 /home/amensagem.org/public/wp-includes/plugin.php(565): WP_Hook->do_action()
#4 /home/amensagem.org/public/wp-includes/class-wp.php(418): do_action_ref_array()
#5 /home/amensagem.org/public/wp-includes/class-wp.php(818): WP->parse_request()
#6 /home/amensagem.org/public/wp-includes/functions.php(1342): WP->main()
#7 /home/amensagem.org/public/wp-blog-header.php(16): wp()
#8 /home/amensagem.org/public/index.php(17): require('...')
#9 {main}
  thrown in /home/amensagem.org/public/wp-includes/functions.php on line 3831

Warning: Undefined variable $handler in /home/amensagem.org/public/wp-content/themes/vantage/premium/addons/ajax-comments/ajax-comments.php on line 73

Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, no array or string given in /home/amensagem.org/public/wp-includes/functions.php:3831
Stack trace:
#0 /home/amensagem.org/public/wp-includes/class-wp-fatal-error-handler.php(245): wp_die()
#1 /home/amensagem.org/public/wp-includes/class-wp-fatal-error-handler.php(156): WP_Fatal_Error_Handler->display_default_error_template()
#2 /home/amensagem.org/public/wp-includes/class-wp-fatal-error-handler.php(60): WP_Fatal_Error_Handler->display_error_template()
#3 [internal function]: WP_Fatal_Error_Handler->handle()
#4 {main}
  thrown in /home/amensagem.org/public/wp-includes/functions.php on line 3831