Bad Request (#400): Invalid data received for parameter "search".

[RGTimothy]

I was using Yii 2.0.3 with select2 widget. Its been working until I update my composer (also update all dependencies automatically) today.

Then now I always get this error whenever I type some string : "Bad Request (#400): Invalid data received for parameter "search"."

This is my code below

$initScript = <<< SCRIPT
function (element, callback) {
    var id=\$(element).val();
    if (id !== "") {
        \$.ajax("{$url}?id=" + id, {
        dataType: "json"
        }).done(function(data) {
            callback(data.results);
        });
    }
}
SCRIPT;
    //echo $datetime_now;
    echo $form->field($model, 'customer_id')->widget(Select2::classname('tes'), [
        'options' => ['placeholder' => 'Search for a Customer ...'],
        'pluginOptions' => [
            'allowClear' => true,
            'minimumInputLength' => 1,
            'ajax' => [
                'url' => $url,
                'dataType' => 'json',
                'data' => new JsExpression('function(term,page) { return {search:term}; }'),
                'results' => new JsExpression('function(data,page) { 
                    if(data.results != 0) { 
                        $("#custid").val(data.results[0]["id"]);
                    }
                    else {}
                    return {results:data.results}; 
                }'),
            ],
            'initSelection' => new JsExpression($initScript),
            // 'formatNoMatches'=>'No matches found. Click here to add new Customer',
            'formatNoMatches'=>'No matches found. You can contact Customer Service to add a new customer data.',
        ],
        'pluginEvents' => [
            "change" => 'function(data) { 
                var data_id = data.added["id"];
                $("#custid").val(data_id);
            }',
        ],
    ]);

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