错误来自auth路由集中的login？

楼上的朋友，以下是我的路由

Route::group(['domain' => 'adm.aaa.com', 'middleware' => 'web'], function () { 

    Route::get('/login', 'Auth\Admin\AuthController@showLoginForm');
    Route::post('/login', 'Auth\Admin\AuthController@login');
    Route::get('/logout', 'Auth\Admin\AuthController@logout');

    Route::get('/register', 'Auth\Admin\AuthController@showRegistrationForm');
    Route::post('/register', 'Auth\Admin\AuthController@register');

    Route::get('/password/reset/{token?}', 'Auth\Admin\PasswordController@showResetForm');
    Route::post('/password/email', 'Auth\Admin\PasswordController@sendResetLinkEmail');
    Route::post('/password/reset', 'Auth\Admin\PasswordController@reset');



    Route::group(['middleware' => ['auth']], function () {
        Route::get('/',['as'=>'adm.index','uses'=>'Web\U\Admin\Index@index']); 
    });