上传附件导入，确认弹框取消后，无法上传附件

今天遇到的一个问题

功能描述：导入订单，上传文件，先校验系文件中要导入的订单系统中是否已经存在，如果有，就弹框提示，要不要导入，确定就继续导入，取消用户就重新修改上传。

问题描述：点击取消之后，上传附件的控件无法再次点击

HTML代码如下：

<div id="divMain" style="70%">
    <div class="form-horizontal">
        <table class="table table-bordered table-striped" style="100%">
            <tbody>
                <tr>
                    <td style="100px">
                        @Html.Factory().DropDownList().Enum("AgreementTypeEnum").NgModel("c.vm.IsAgreement")
                    </td>
                    <td>
                        <e2-file-uploader ng-model="c.vm.files" type=".xls,.xlsx,XLS,.XLSX" multiple="false" show-badge="false" upload-finished="c.Event.FileUploaded(file, response, status)">
                            <i class="fa fa-upload"></i>&nbsp;<font translate="Attachment"></font>
                        </e2-file-uploader>
                    </td>
                </tr>
            </tbody>
        </table>
    </div>


    <div class="clearfix"></div>
    <div ng-if="(c.vm.SucceedCount>0 ||c.vm.FailedCount>0) && !c.vm.ErrorMessage">
        成功导入{{c.vm.SucceedCount}}条数据，失败{{c.vm.FailedCount}}条,<a href="{{ c.vm.FailedExcel}}" target="_parent">失败下载</a>
    </div>
    <div ng-if="(c.vm.SucceedCount ==0 && c.vm.FailedCount==0) && c.vm.ErrorMessage==undefined">
        没有可导入数据
    </div>
    <div>{{c.vm.ErrorMessage}}</div>
    </div>

js代码如下：

def.ContentState('Import', "id").Controller(['pb', 'pbui', 'serverVm', '$scope', '$timeout', '$stateParams', function (pb, pbui, serverVm, $scope, $timeout, $stateParams) {
    var c = pb.Super(this, serverVm, $scope, false);
    c.vm = { files: [], template: '../Template/ImportFormat/MyPo.xlsx', IsAgreement:"协议" };

    c.Event = {
        FileUploaded: function (file, response, status) {
            pbui.PutProcessing("divMain");
            c.vm.Items = [];
            var flag = false;
            if (c.vm.IsAgreement == "协议") {
                flag = true;
            }
            pb.CallAction('/PO/MyPO/IsExistPONo', 'fileName=' + response.SavedFileName + "&IsAgreementOrder=" + flag, function (result) {
                if (result.data != "") {
                    pbui.Confirm('ConfirmImportExistSamePONo', result.data).then(function () {
                        c.Event.Import(response, flag);
                    }, function () {
                            c.vm.files.splice(0, c.vm.files.length);
                            pbui.PutProcessing("");
                    })                    
                }
                else {
                    c.Event.Import(response, flag);
                }
            });
        },
        Import: function ( response, flag) {
              pb.CallAction('/PO/MyPO/Import', 'fileName=' + response.SavedFileName + "&IsAgreementOrder=" + flag, function (result) {
                c.vm.files.splice(0, c.vm.files.length);
                result.data = JSON.parse(result.data);
                if (result.isRcResult) {
                    c.vm.FailedCount = result.data.FailedCount;
                    c.vm.SucceedCount = result.data.SucceedCount;
                    c.vm.FailedExcel = "../Download/DownloadAttachment?psSaveTo=&psOriginalFileName=POItem.xlsx&psSavedFileName=" + result.data.FailedExcel;
                    c.vm.ErrorMessage = result.data.ErrorMessage;
                }
                pbui.PutProcessing("");
            });
        }
    }
}]);

因为选择文件上传后会有一个正在加载对的遮罩层，点击取消后还一直在转圈

pbui.PutProcessing("divMain");

先是加了这个取消遮罩

pbui.PutProcessing("");