I’m having the same problem. This is what came up for site lionelnoble.com:
Warning: include_once(): Failed opening ‘/home1/lionelno/public_html/wp-content/plugins/hummingbird-performance/core/class-utils.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php70/root/usr/share/pear’) in /home1/lionelno/public_html/wp-content/advanced-cache.php on line 23
Warning: include_once(/home1/lionelno/public_html/wp-content/plugins/hummingbird-performance/core/class-abstract-module.php): failed to open stream: No such file or directory in /home1/lionelno/public_html/wp-content/advanced-cache.php on line 24
Warning: include_once(): Failed opening ‘/home1/lionelno/public_html/wp-content/plugins/hummingbird-performance/core/class-abstract-module.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php70/root/usr/share/pear’) in /home1/lionelno/public_html/wp-content/advanced-cache.php on line 24
Warning: include_once(/home1/lionelno/public_html/wp-content/plugins/hummingbird-performance/core/modules/class-module-page-cache.php): failed to open stream: No such file or directory in /home1/lionelno/public_html/wp-content/advanced-cache.php on line 25
Deleted the plugin, and this extra line was then added when I refreshed the page:
Warning: include_once(): Failed opening ‘/home1/lionelno/public_html/wp-content/plugins/hummingbird-performance/core/modules/class-module-page-cache.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php70/root/usr/share/pear’) in /home1/lionelno/public_html/wp-content/advanced-cache.php on line 25
Reinstalled, and this now appears at the top (as before):
Warning: include_once(): Failed opening ‘/home1/lionelno/public_html/wp-content/plugins/hummingbird-performance/core/class-abstract-module.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php70/root/usr/share/pear’) in /home1/lionelno/public_html/wp-content/advanced-cache.php on line 24
Warning: include_once(/home1/lionelno/public_html/wp-content/plugins/hummingbird-performance/core/modules/class-module-page-cache.php): failed to open stream: No such file or directory in /home1/lionelno/public_html/wp-content/advanced-cache.php on line 25
Warning: include_once(): Failed opening ‘/home1/lionelno/public_html/wp-content/plugins/hummingbird-performance/core/modules/class-module-page-cache.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php70/root/usr/share/pear’) in /home1/lionelno/public_html/wp-content/advanced-cache.php on line 25
Help Please! It seems that even deleting the plugin doesn’t solve the problem.