form request not working for controllers within subfolder of Controller folder

My folder structure for controllers is:

and I use following route code to access those controllers.

here I have allocated subfolders inside Controller folder and updated namespaces as per needed on files and routes accordingly,this works perfectly,however when I use request file for validating form.It gives error:

Argument 1 passed to App\Http\Controllers\site\usersController::store() must be an instance of Illuminate\Http\Request, string given

but when I move all controllers file to Controller folder and don't use subfolder,form request validation works.What should I do beside updating namespace in routes and controller file to make everything work?

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