Fatal error: Uncaught Error: Class "PHP_UML_Output_Xmi_AbstractBuilder" not found in C:\xampp\htdocs\php\pear\PHP\UML\Output\Xmi\BuilderImpl1.php:29 Stack trace: #0 {main} thrown in C:\xampp\htdocs\php\pear\PHP\UML\Output\Xmi\BuilderImpl1.php on line 29