Fatal error: Uncaught Error: Interface "League\CommonMark\Environment\EnvironmentInterface" not found in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\league\commonmark\src\Environment\Environment.php:47 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\league\commonmark\src\Environment\Environment.php on line 47