C#插件實現單據審核不通過報錯提示

    public class CheckPurPrice : AbstractValidator
    {
        public override void Validate(ExtendedDataEntity[] dataEntities, ValidateContext validateContext, Context ctx)
        {
            foreach (ExtendedDataEntity dyn in dataEntities)
            {
                long fid = Convert.ToInt64(dyn["Id"]);
                string billNo = dyn["BillNo"].ToString();//單據編碼
                //異常信息
                string _errorMsg = string.Empty;                                   
                //獲取當前用戶
                string userName = this.Context.UserName;
                if (userName != "聶X華")
                {
                    _errorMsg = string.Format("應付單【{0}】只能由XXX審核。", billNo);
                }
                if (!string.IsNullOrEmpty(_errorMsg))
                {
                    string titleInfo = string.Format("應付單-審核");
                    ValidationErrorInfo errorInfo = new ValidationErrorInfo(string.Empty, fid.ToString()
                       , dyn.DataEntityIndex, dyn.RowIndex
                       , fid.ToString(),
                       _errorMsg, titleInfo, ErrorLevel.Error);
                    validateContext.AddError(dyn, errorInfo);
                }
            }
        }
    }