Fatal error: Uncaught Error: Interface "Workerman\Coroutine\WaitGroup\WaitGroupInterface" not found in E:\www\xmvc\v5.0\composer\vendor\workerman\coroutine\src\WaitGroup\Fiber.php:12 Stack trace: #0 {main} thrown in E:\www\xmvc\v5.0\composer\vendor\workerman\coroutine\src\WaitGroup\Fiber.php on line 12