500 (Internal Server Error) in Laravel - php

Question

Please help. I have this jQuery code
$('.modal-footer').on('click', '.edit', function() {
var serializedData = $(".form-horizontal").serialize();
var criscore = new Array();
$('input[name^=criscore]').each(function(){
criscore.push({score:$(this).val(), criid:$(this).data('criid')});
});
for (var key in criscore) {
var score = criscore[key].score;
var criid = criscore[key].criid;
//console.log(score +" s "+ criid);
$.ajax({
method: 'post',
url: '/judges/candidates/scorecandidates',
headers: {'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')},
data: {
'_token': $('input[name=_token]').val(),
'canId': $('input[name=canId]').val(),
'catId': $('input[name=catId]').val(),
'criId': criid,
'score': score,
'judgeId': $('input[name=judgeId]').val()
},
success: function(data) {
console.log(data);
}
});
}
});
and in my controller is
public function scorecandidates(Request $req)
{
$data = new Score();
$data->canId = $req->canId;
$data->catId = $req->catId;
$data->criId = $req->criId;
$data->score = $req->score;
$data->judgeId = $req->judgeId;
$data->save();
return response()->json($data);
}
my problem is that it is still keeps having an 500 (Internal Server Error)
Even though I already put the csrf token is different ways.. Can any body help me?
Thank you