Deprecated: Sabberworm\CSS\CSSList\Document::render(): Implicitly marking parameter $oOutputFormat as nullable is deprecated, the explicit nullable type must be used instead in C:\Apache24\htdocs\BookStack\vendor\sabberworm\php-css-parser\src\CSSList\Document.php on line 157

Fatal error: Uncaught Error: Class "Sabberworm\CSS\CSSList\CSSBlockList" not found in C:\Apache24\htdocs\BookStack\vendor\sabberworm\php-css-parser\src\CSSList\Document.php:17 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\BookStack\vendor\sabberworm\php-css-parser\src\CSSList\Document.php on line 17