Laravel sweetalert deleting id

how does the error comes up in route is there something went wrong to my code? my route is correct inside script in url, how can i fix?

This is my route web.php

Route::post('deletenews/{id}', 'AllSystemController@deletenewsdata')->name('delete.news.data');

this is my loop inside my blade

 @foreach($news as $row)
 <tr>
<td><img src="/" class="img-thumbnail" width="50"></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>
<div class="dropdown">
  <button class="btn btn-primary" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">&nbsp;<i class="feather icon-chevron-down"></i></button>
  <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
    <a style="color:black; font-weight: bold;" class="dropdown-item" href="" target="_blank">View</a>
    <a style="color:black; font-weight: bold;" class="dropdown-item" href="" target="_blank" class="btn btn-primary">Edit</a>
    <a onclick="deleteConfirmation()" style="color:black; font-weight: bold;" class="dropdown-item">Delete</a>
  </div>
  </div>
 </td>

 </tr>
 @endforeach

this is my script inside my blade

<script type="text/javascript">
function deleteConfirmation(id) {
    swal({
        title:"Are you sure you want to delete this?",
        text: "You won't be able to revert this!",
        type: "warning",
        showCancelButton: true,
        confirmButtonColor: '#d33',
        cancelButtonColor: '#3085d6',
        cancelButtonText: "No, cancel!",
        confirmButtonText: "Yes, delete it!",
    }).then(function (e) {

        if (e.value === true) {
            var CSRF_TOKEN = $('meta[name="csrf-token"]').attr('content');
            $.ajax({
                type: 'POST',
                url: "/" + id,
                data: {_token: CSRF_TOKEN},
                dataType: 'JSON',
                success: function (results) {
                    if (results.success === true) {
                        swal({
                          title: "Done!",
                          text: results.message,
                          type: "success",
                          showConfirmButton: false
                        });
                        location.reload(true);
                        
                    } else {
                        swal({
                          title: "Error!",
                          text: results.message,
                          type: "error"
                        });
                        location.reload(true);
                        // swal("Error!", results.message, "error");
                    }
                }
            });

        } else {
            e.dismiss;
        }

    }, function (dismiss) {
        return false;
    })
}
</script>

Error: POST http://localhost/kauswagan/deletenews/8 500 (Internal Server Error)

via Chebli Mohamed