Fatal error: Uncaught Error: Class 'League\CommonMark\Block\Element\AbstractStringContainerBlock' not found in C:\xampp73\htdocs\MonitoresCIE_C\vendor\league\commonmark\src\Block\Element\Heading.php:20 Stack trace: #0 {main} thrown in C:\xampp73\htdocs\MonitoresCIE_C\vendor\league\commonmark\src\Block\Element\Heading.php on line 20