error when use middleware in api file

[iranwebpro]

i used jwt.auth for authenticate and zizaco for authorization.
when i use zizaco middlewares in api file, like bellow:

Route::group(['middleware' => 'jwt.auth'], function(){
Route::group(['prefix' => 'admin', 'middleware' => ['role:admin']], function() {
Route::post('/category',['middleware' => ['permission:createcategory'], 'uses'=>'CategoryController@create']);
});
});

i have a problem in test by postman: