Javascript — Laravel 5 Ajax 500 (Внутренняя ошибка сервера) при отправке запроса

Я получаю эту ошибку «500 (Внутренняя ошибка сервера) send @ jquery.min.js: 5ajax @ jquery.min.js: 5 (анонимно) @ (index): 260dispatch @ jquery.min.js: 3v.handle @ jquery .min.js: 3 «всякий раз, когда я пытаюсь сделать почтовый запрос с использованием ajax в laravel и буду очень признателен за помощь.
Ниже код на мой взгляд:

    <form action="" >

<div class="switch-field">
<h5>Academic Level</h5>
<input class="changedVal" type="radio" id="highschool" name="academic_level" value="Highschool" />
<label for="highschool">High School</label>
<input class="changedVal" type="radio" id="college" name="academic_level" value="College" />
<label for="college">College</label>
<input class="changedVal" type="radio" id="university" name="academic_level" value="University" />
<label for="university">University</label>
<input class="changedVal" type="radio" id="masters" name="academic_level" value="Masters" />
<label for="masters">Master's</label>
<input class="changedVal" type="radio" id="phd" name="academic_level" value="Phd" />
<label for="phd">PhD</label>
</div>

<div class="switch-field">
<h5>Spacing</h5>
<input class="changedVal" type="radio" id="double_spaced" name="spacing" value="Double Spaced" />
<label for="double_spaced">Double Spaced</label>
<input class="changedVal" type="radio" id="single_spaced" name="spacing" value="Single Spaced" />
<label for="single_spaced">Single Spaced</label>
</div>

<div>
<h5>No. of pages</h5>
<input class="changedVal" type="number"  name="no_pages" min="1" max="10" value="1" />
</div>

<div class="switch-field" style="margin-bottom:25px;">
<h5>Deadline</h5>
<input class="changedVal" type="radio" id="14_days" name="deadline" value="14 Days" />
<label for="14_days">14 Days</label>
<input class="changedVal" type="radio" id="7_days" name="deadline" value="7 Days" />
<label for="7_days">7 Days</label>
<input class="changedVal" type="radio" id="5_days" name="deadline" value="5 Days" />
<label for="5_days">5 Days</label>
<input class="changedVal" type="radio" id="3_days" name="deadline" value="3 Days" />
<label for="3_days">3 Days</label>
<input class="changedVal" type="radio" id="48_hrs" name="deadline" value="48 Hrs" />
<label for="48_hrs">48 Hrs</label>
<input class="changedVal" type="radio" id="24_hrs" name="deadline" value="24 Hrs" />
<label for="24_hrs">24 Hrs</label>
</div>

<input style="margin-left:-300px;margin-top:0px;width:200px;border:none;background-color:transparent;font-size:30px;color:#32c5d2;" type="text" id="testVal">

<script type="text/javascript" >
var coun=0;

$('.changedVal').change(function(){

var level=$('input[name=academic_level]:checked').val();
var spacing=$('input[name=spacing]:checked').val();
var pages=$('input[name=no_pages]').val();
var deadline=$('input[name=deadline]:checked').val();

var data={academic_level:level,spacing:spacing,pages:pages,deadline:deadline};

console.log(data);
$.ajax({
url: '/pricecalculator',
type: 'post',
data: data,
success: function(msg){

console.log('data returned='+msg);

$('#testVal').val(msg);
}
});
});
</script>

</form>

Ниже приведен код моего маршрута:

    Route::post('/pricecalculator', array('uses' => 'MainController@priceCalculator'));

Ниже приведен код моего контроллера:

   namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use Illuminate\Support\Facades\Input;
use App\Http\Controllers\Controller;
use App\Prices;
use View;

class MainController extends Controller
{
public function priceCalculator(Request $request)
{
$request->all();

dd($request);
}
}