SpecialDaysTable - try to add row - error

Hi,
When trying to add a row an error occurs ("The input string was in the wrong format" and "failed to cast object type Gurux.DLMS.GXDLMSMeter to type Gurux.DLMS.AMI.Message.DB.GXDevice"):

System.FormatException: Входная строка имела неверный формат.
в System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
в System.Number.ParseUInt32(String value, NumberStyles options, NumberFormatInfo numfmt)
в System.UInt16.Parse(String s, NumberStyles style, NumberFormatInfo info)
в System.String.System.IConvertible.ToUInt16(IFormatProvider provider)
в Gurux.DLMS.GXDLMSClient.Method(Object name, ObjectType objectType, Int32 index, Object value, DataType type)
в Gurux.DLMS.GXDLMSClient.Method(GXDLMSObject item, Int32 index, Object data)
в Gurux.DLMS.Objects.GXDLMSSpecialDaysTable.Delete(GXDLMSClient client, GXDLMSSpecialDay entry)
в Gurux.DLMS.UI.GXDLMSSpecialDaysTableView.OnSpecialDaysDlg(GXActionArgs arg, GXDLMSSpecialDaysTableDlg dlg, GXDLMSSpecialDay it) в C:\vsts-agent\_work\4\s\development\GXDLMSSpecialDaysTableView.cs:строка 126