Fatal error: Uncaught Error: Class "Zephir\Optimizers\OptimizerAbstract" not found in C:\xampp\htdocs\ducev\vendor\rubix\tensor\optimizers\TensorRefOptimizer.php:12 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ducev\vendor\rubix\tensor\optimizers\TensorRefOptimizer.php on line 12