error message and voicemail doesn't work

[argos]

Hello,

we have a problem with voicemails and there is an error message in the 3cx system log (it's in the log more than 1000 times a day) as follows:

2022/08/08 10:58:55.704|2736|0009|Erro|VMMonitor: Error parsing voicemail info file 'C:\ProgramData\3CX\Instance1\Data\Ivr\Voicemail\Extensions\00\vmail_015128636_00_20161221145536.xml'
2022/08/08 10:58:55.704|2736|0009|Excpt|System.Xml.XmlException: An error occurred while parsing EntityName. Line 3, position 65.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.HandleEntityReference(Boolean isInAttributeValue, EntityExpandType expandType, Int32& charRefEndPos)
at System.Xml.XmlTextReaderImpl.ParseAttributeValueSlow(Int32 curPos, Char quoteChar, NodeData attr)
at System.Xml.XmlTextReaderImpl.ParseAttributes()
at System.Xml.XmlTextReaderImpl.ParseElement()
at System.Xml.XmlTextReaderImpl.ParseElementContent()
at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
at System.Xml.Linq.XDocument.Load(Stream stream, LoadOptions options)
at VBMutils.VoiceMailInfo.LoadInfo()

Does anyone have any advice or suggestion as to where we could look for the cause?

Best regards