Warning: Class "Sabberworm\CSS\Property\Declaration" not found in /home/companf/www/vendor/sabberworm/php-css-parser/src/Rule/Rule.php on line 11

Fatal error: Uncaught AssertionError: assert($aliasWasCreated) in /home/companf/www/vendor/sabberworm/php-css-parser/src/Rule/Rule.php:12 Stack trace: #0 /home/companf/www/vendor/sabberworm/php-css-parser/src/Rule/Rule.php(12): assert(false, 'assert($aliasWa...') #1 {main} thrown in /home/companf/www/vendor/sabberworm/php-css-parser/src/Rule/Rule.php on line 12