It looks like the link pointing here was faulty. Maybe try searching?

Fatal error: Uncaught ErrorException: md5_file(/home/faidace1/public_html/wp-content/litespeed/css/404.css.tmp): failed to open stream: No such file or directory in /home/faidace1/public_html/wp-content/plugins/litespeed-cache/src/optimizer.cls.php:121 Stack trace: #0 [internal function]: litespeed_exception_handler(2, 'md5_file(/home/...', '/home/faidace1/...', 121, Array) #1 /home/faidace1/public_html/wp-content/plugins/litespeed-cache/src/optimizer.cls.php(121): md5_file('/home/faidace1/...') #2 /home/faidace1/public_html/wp-content/plugins/litespeed-cache/src/optimize.cls.php(778): LiteSpeed\Optimizer->serve('https://faidace...', 'css', true, Array) #3 /home/faidace1/public_html/wp-content/plugins/litespeed-cache/src/optimize.cls.php(307): LiteSpeed\Optimize->_build_hash_url(Array) #4 /home/faidace1/public_html/wp-content/plugins/litespeed-cache/src/optimize.cls.php(240): LiteSpeed\Optimize->_optimize() #5 /home/faidace1/public_html/wp-includes/class-wp-hook.php(308): LiteSpeed\Optimize->finalize('<!DOCTYPE html>...') in /home/faidace1/public_html/wp-content/plugins/litespeed-cache/src/optimizer.cls.php on line 121