安装 Laravel-debugbar 后程序报错

Symfony \ Component \ Debug \ Exception \ FatalThrowableError (E_RECOVERABLE_ERROR)
Argument 1 passed to Illuminate\Auth\TokenGuard::__construct() must implement interface Illuminate\Contracts\Auth\UserProvider, null given, called in D:\phpstudy_a\PHPTutorial\WWW\zjart-xwfw\vendor\laravel\framework\src\Illuminate\Auth\AuthManager.php on line 157
请问是怎么解决呀？