Laravel: Holen 405 Methode ist Nicht Zugelassen, während die Bereitstellung von Daten mithilfe von jquery-ajax-api, um Daten zu speichern

Ich versuche zum speichern von Daten in einer Datenbank mithilfe von jQuery-ajax-api in Laravel 4.* und Sie erhalten einen 405 Fehler.

Ansicht

{{Form::open(array("","id"=>"frmProcessLevel"))}}
   <input name="{{$result->id.'_'.str_replace(' ','-',$title)}}" id="processLevel">

   <h3>{{$title}} Impact rating</h3>
   <table class="table table-bordered" style="font-size: 12px">
       <thead>
           <tr>
               <th>Level</th>
               <th>Category</th>
               <th>Description</th>
           </tr>
       </thead>
       <tbody class="selectable selectable-rows">
           @foreach($impact_rating as $key => $value)
                <tr data-key="{{$key}}">
                    <td>{{$key}}</td>
                    <td>{{$impact_cat[$key]}}</td>
                    <td>{{$value}}</td>
                </tr>
           @endforeach
       </tbody>
   </table>
   {{Form::token()}}
   {{Form::submit('Save')}}
{{Form::close()}}

<script>
        //Submit the form functions
        $("#frmProcessLevel").submit(function (e) {
            e.preventDefault();
            var selectedLevel = $("#processLevel").val();
            var datastring = 'selectedLevel='+selectedLevel;
            //alert(selectedLevel);
            $.ajax({ 
            headers: {
                    'X-CSRF-Token': $('meta[name="_token"]').attr('content')
                },
                url: "/bia/create_critical_process/",
                type: "post",
                data: datastring,
                success: function (data) {
                    console.log(data);
                }
            }, "json");
        });
</script>

Routen

Route::post('/bia/create_critical_process',array('before' => 'csrf','uses'=>'BiaController@createBiaStepThree'));

Controller

 public function createBiaStepThree(){
        $data = Input::all();
        $last_insert_bia_id = Session::get('last_insert_bia_id');
        if (Request::ajex())
        {
            Log::info(Input::all());
            $bia = new CriticalProcessStepThree();
            $bia->impact_rating_clinical = $data['selectedLevel'];
            $bia->key_process_fk = 1;
            $bia->bia_entry_fk = $last_insert_bia_id;
            $bia->save();
        }
    }

Passing token: http://words.weareloring.com/development/laravel/laravel-4-csrf-tokens-when-using-jquerys-ajax/