函数 App/GetSPANList 在服务器上返回 401 错误 C# asp.net

如何解决函数 App/GetSPANList 在服务器上返回 401 错误 C# asp.net

以下方法在服务器上返回 401 错误。因为我没有看到任何错误。请说明为什么会出现 401 错误

function loadSPANByMZ() {
    try {
        showLoading();
        var OperationType = "";
        if (R4GStateSelected != "Select") {
            if ($(mzoneid).val() != "Select") {
                if ($(activitytypeid).val() != "Select") {
                    //call CurrentGroupName UMS variable
                    var UserType = CurrentGroupName;
                    var SpanType = $(spantypeid + ' option:selected').val().toupperCase();
                    var MZone = $(mzoneid + ' option:selected').val();
                    OperationType = $(activitytypeid + ' option:selected').val();
                    var Values = { "USERTYPE": UserType,"SPANTYPE": SpanType,"MZONE": MZone,"OPERATIONTYPE": OperationType.toupperCase() };
                    //$(gridSpanlisttable).empty();
                    $.ajax({
                        type: "POST",url: AppConfig.PrefixURL + "App/GetSPANList",data: JSON.stringify(Values),contentType: "application/json; charset=utf-8",dataType: "json",async: false,success: function (response) {                            
                            displaySpanList(response,SpanType,MZone,OperationType);
                            //hideLoading();
                        },error: function (response) {
                            hideLoading();
                            $(dataContent).hide();
                        },complete : function(response)
                        {
                            hideLoading();
                            
                }

                });
        }
        
        }
    }

//},} 
catch (e) {
    hideLoading();
    $(dataContent).show();
}

}