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i want to use yajra datatable in my laravel 5.6 app i have install the yajra package using this (composer require yajra/laravel-datatables-oracle) and include the js in my layout files when i run the app with php artisan serve it show this error (DataTables warning: table id=datatableclass - Invalid JSON response. ) any one can solve this thanks in advance.

config/app

'providers' => [

    ....

    Yajra\Datatables\DatatablesServiceProvider::class,

],

'aliases' => [

    ....

    'Datatables' => 'Yajra\Datatables\Facades\Datatables',

]

this is ajax call

$(document).ready(function() {
    $('#datatableclass').DataTable({
        processing: true,
        serverSide: true,
        ajax: '{{ route('class.getclasses') }}',
        columns: [
            {data: 'id', name: 'id'},
            {data: 'class_name', name: 'class_name'},

        ]
    });
});

this is my routes

Route::resource('/class','ClassController');
    Route::get('/class/get-classes', 'ClassController@getClass')->name('class.getclasses');

this is my controller

use Illuminate\Http\Request;
use App\Http\Requests\SchoolClassRequest;
use App\SchoolClass;
use Datatables;
     public function index()
        {
            return view('school_admin.entry.class');
        }
        public function getClass()
        {
            $school = auth()->user()->school()->first();
            $classes = SchoolClass::where('school_id', $school->id)->get();
            return DataTables::of($classes)->make(true);

        }

and this is my table in views

<table class="table" id="datatableclass">
      <thead>
        <tr>
          <th data-field="ID">Id</th>
          <th data-field="Class" data-sortable="true">Class Name</th>
      </tr>
    </thead>


</table>
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