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errorPlacement: function(error, element) {
            if($(element).parent().hasClass('input-group')) {
                error.insertAfter($(element).parent());
            }else if($(element).hasClass('select2')) {
                error.insertAfter($(element).next());
            }else {
                error.insertAfter(element);
            }
        },

$("#select_WorkingArea").select2({
        width: '100%',
        language: 'tr',
        placeholder: "Bir faaliyet alanı belirtiniz"
    });

    $('.select2').on("select2:close", function (e) {
        $(this).valid();
    });
    
    <select class="form-control select2" id="select_City" name="city">
                                                    <option></option>
                                                    </select>