Class hash does not exist laravel 5.2

I'm facing issue of "Class hash does not exist". I know there are same question related this but these are not enough for me. Here I'm loading routes as per user device. As per mobile I using different routes as shown below:

Route::group(['middleware' => ['web']], function () {

    if(SiteHelpers::isMobileViewEnabled() == true && Mobile::isMobile() == true && Mobile::isTablet() == false){

        require app_path('Http/Routes/mui.php');

    }else{

        require app_path('Http/Routes/desktop.php');
    }

...

Here is SiteHelper code

public static function isMobileViewEnabled()
{
    $isEnabled = false;
    $user = Auth::user();
    $getEnabled = DB::table('setting')->where('setting_name', 'Mobile UI')->first();
    if(isset($getEnabled) && $getEnabled->setting_value==1){
        $isEnabled = true;
    }
    return $isEnabled;

}

When I use

Auth::user()

Than I'm getting error

Class hash does not exist

I don't know whats going wrong, Please let me know where I making mistake.

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