无法读取未定义的属性“调用”检查元素“UnitName”时发生异常，请检查“minLength”方法

如何解决无法读取未定义的属性“调用”检查元素“UnitName”时发生异常，请检查“minLength”方法

仅当该字段实际有效时，我才会收到此错误。如果该字段为“空白”，则 invalidHandler 会按预期触发，但如果该字段中有任何文本，我会收到上述错误。全文如下：

jquery.validate.js:791 Uncaught TypeError: Cannot read property 'call' of undefined.  Exception occurred when checking element UnitName,check the 'minLength' method.
    at $.validator.check (jquery.validate.js:791)
    at $.validator.element (jquery.validate.js:502)
    at $.validator.onfocusout (jquery.validate.js:302)
    at HTMLInputElement.delegate (jquery.validate.js:433)
    at HTMLFormElement.dispatch (jquery.js:5183)
    at HTMLFormElement.elemData.handle (jquery.js:4991)
    at Object.trigger (jquery.js:8249)
    at Object.simulate (jquery.js:8318)
    at HTMLDocument.handler (jquery.js:8352)

无论是否设置 minLength 值，都会出现错误。

这是我的验证码：

 validator = $("#SaveAssessmentForm").validate({
        rules: {
            UnitName: {
                required: true,minLength: 3,maxLength: 150
            },},invalidHandler: function (event,validator) {
            swal.fire({
                "title": "","text": "Assessment Name is required!","type": "error","confirmButtonClass": "btn btn-secondary"
            });
            event.preventDefault();
            KTUtil.scrollTop();
        },submitHandler: function (form) {
            return false;
        }
    });

});

这是我的提交代码：

   function saveAssessment(assessmentId,type) {
    var btn = $('#saveAssessment');
    var form = $('#SaveAssessmentForm');
    if (validator.form()) {
    KTApp.block(doc,{ message: 'Please wait while we save the Assessment...' });
    form.ajaxSubmit({
        data: {
            AssessmentId: assessmentId
        },type: 'POST',success: function (data) {
            KTApp.unblock(doc);
            KTApp.unprogress(btn);
            swal.fire({
                "title": "","text": "The request has been saved!","type": "success","confirmButtonClass": "btn btn-secondary","confirmButtonText": 'Close',}).then(function () {
                if (type == 1) {
                    window.location.href = '@Url.Action("CompetencyConfiguration","Config",new {area = "Competency"})'
                }
                else {
                    location.reload();
                }
            });
        },error: function () {
            KTApp.unblock(doc);
            KTApp.unprogress(btn);
            swal.fire({
                "title": "","text": "Something went wrong during submission. Please review your form and try again. If the issue persists then please contact Support.","confirmButtonClass": "btn btn-secondary"
            });
        }
    });
    }

}

这是我的表格：

   @using (Html.BeginForm("SaveAssessment",FormMethod.Post,new { id = "SaveAssessmentForm" }))
    {
        <div class="row">
        <div class="col-md-6">
            <label class="kt-popover kt-font-bold" data-toggle="kt-popover" data-placement="top" data-trigger="hover" data-html="true" data-content="The name of the Assessment that will be displayed. (Max-Length:150)">Assessment Name</label>
            @Html.TextBoxFor(x => x.AssessmentName,new { @class = "form-control",id = "AssessmentName" })
        </div>
        <div class="col-md-2">
            <label class="kt-popover kt-font-bold" data-toggle="kt-popover" data-placement="top" data-trigger="hover" data-html="true" data-content="The date that the Assessment will become effective and will display for users to take.">Effective Date</label>
            <input type="text" class="date form-control" name="EffectiveDate" id="EffectiveDate" value="@(Model.EffectiveDate ?? "")" placeholder="Effective Date" />
        </div>
        <div class="col-md-2">
            <label class="kt-popover" data-toggle="kt-popover" data-placement="top" data-trigger="hover" data-html="true" data-content="The date that the Assessments is set to expire. Useful for turning off Assessments on a certain date. Leave blank to never expire">Expiration Date</label>
            <input type="text" class="date form-control" name="ExpirationDate" id="ExpirationDate" value="@(Model.ExpirationDate ?? "")" placeholder="Effective Date" />
        </div>
        <div class="col-md-2">
            <label class="kt-popover" data-toggle="kt-popover" data-placement="top" data-trigger="hover" title="" data-html="true" data-content="Determines whether the Assessment is available.">Active</label>
            <div class="" style="">
                <span class="kt-switch kt-switch--outline kt-switch--icon kt-switch--success kt-switch--sm">
                    <label style="vertical-align:middle;">
                        @Html.CheckBoxFor(x => x.Active,new { Active = true })
                        <span></span>
                    </label>
                </span>
            </div>
        </div>
    </div>
        <div style="padding:20px">
            <div class="kt-portlet kt-portlet--bordered">
                <div class="kt-portlet__head kt-portlet__head--lg headingTwo">
                    <div class="kt-portlet__head-label">
                        <h4 class="kt-portlet__head-title" style="color:white">
                            Units
                        </h4>
                    </div>
                    <div class="kt-portlet__head-toolbar">
                        <span style="padding-left:300px">
                            <label style="color:white;padding-right:10px">Add existing unit:</label>
                        </span> 
                        <span>
                            @Html.DropDownList("Unit",new SelectList(Model.unitSelect,"Id","Text"),"Select a Unit",style = "width: 500px" })
                        </span> 
                    </div>
                </div>
                <div class="kt-portlet__body" id="UnitEditor">
                    @if (Model.Units != null)
                    {
                        foreach (ICAN.Models.Competency.viewmodels.AssessmentUnitModel unit in Model.Units)
                        {
                            Html.RenderPartial("UnitEditorRow",unit);
                        }
                    }
                </div>
            </div>
        </div>
    }