I’m getting a similar error which shows in the header of my blog AND my WP dashboard. The Hummingbird plugin isn’t showing an update available. The errors are:
Warning: include_once(/wp-content/plugins/hummingbird-performance/core/class-abstract-module.php): failed to open stream: No such file or directory in /wp-content/advanced-cache.php on line 24
Warning: include_once(): Failed opening ‘/wp-content/plugins/hummingbird-performance/core/class-abstract-module.php’ for inclusion (include_path=’.:/opt/php73u/lib/php’) in /wp-content/advanced-cache.php on line 24
Warning: include_once(/wp-content/plugins/hummingbird-performance/core/modules/class-module-page-cache.php): failed to open stream: No such file or directory in /wp-content/advanced-cache.php on line 25
Warning: include_once(): Failed opening ‘/wp-content/plugins/hummingbird-performance/core/modules/class-module-page-cache.php’ for inclusion (include_path=’.:/opt/php73u/lib/php’) in /wp-content/advanced-cache.php on line 25
appeared after the update
