Fatal error: Uncaught Error: Class "core\dataformat\base" not found in C:\xampp\htdocs\laberit01\html\moodle\dataformat\json\classes\writer.php:36 Stack trace: #0 {main} thrown in C:\xampp\htdocs\laberit01\html\moodle\dataformat\json\classes\writer.php on line 36