laravel 5.5 + jwt auth 1.0.0-rc.1 报错

Symfony\Component\Debug\Exception\FatalThrowableError thrown with message "Class 'Tymon\JWTAuth\Providers\JWT\Lcobucci' not found"

Stacktrace:
#0 Symfony\Component\Debug\Exception\FatalThrowableError in D:\0WorkCode\tryitzone-download\vendor\tymon\jwt-auth\src\Providers\AbstractServiceProvider.php:134