Why am I getting "Class 'App\Models\NewMod' not found" error?

I am getting App/Models error every time . I have tried the previous solutions given for this problem but none of them could help me. I have changed the name of the model and controller for several times to check whether it is a naming convention problem but could not solve it.

in model:
<?php

namespace App\models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\DB;

class Newmod extends Model
{
 public function add()
{DB::connection('lara1')->insert("insert into abc (id, name) values (?, 
?)', [2, 'pqr']);")}
}
}
in controller:
<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Models\NewMod ;

class NewModController extends Controller
{
public function add()
{
    /*$a= $_GET["name"];

    DB::insert('insert into abc (id, name) values (?, ?)', [2, $a]);*/
    $l= new NewMod();
    $l->add;
    echo "record inserted ";


}
}
in route:
Route::get('ax', 'NewModController@add');

via Chebli Mohamed