There is an error in XML document (64062, -1056)

I added a contact and added notes, when i tried to save the contact. RDM gave me the error below. How can i get back up and running again.

Thank you.

Devolutions.RemoteDesktopManager.Business.DataSources.XmlDeserializationException: There is an error in XML document (64062, -1056). ---> System.InvalidOperationException: There is an error in XML document (64062, -1056). ---> System.Xml.XmlException: '', hexadecimal value 0x0C, is an invalid character. Line 64062, position -1056.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args)
at System.Xml.XmlTextReaderImpl.Throw(Int32 pos, String res, String[] args)
at System.Xml.XmlTextReaderImpl.ParseNumericCharRefInline(Int32 startPos, Boolean expand, StringBuilder internalSubsetBuilder, Int32& charCount, EntityType& entityType)
at System.Xml.XmlTextReaderImpl.ParseCharRefInline(Int32 startPos, Int32& charCount, EntityType& entityType)
at System.Xml.XmlTextReaderImpl.ParseText(Int32& startPos, Int32& endPos, Int32& outOrChars)
at System.Xml.XmlTextReaderImpl.ParseText()
at System.Xml.XmlTextReaderImpl.ParseElementContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XmlTextReader.Read()
at System.Xml.XmlReader.ReadElementString()
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderConnectionArray.Read95_ConnectionMetaInformation(Boolean isNullable, Boolean checkType)
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderConnectionArray.Read185_Connection(Boolean isNullable, Boolean checkType)
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderConnectionArray.Read186_ArrayOfConnection()
--- End of inner exception stack trace ---
at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream)
at Devolutions.RemoteDesktopManager.Managers.SerializationManager.LoadObjectFromString(String str, Type type, Boolean createAnInstanceIfNotExists, String nameSpace)
--- End of inner exception stack trace ---
at Devolutions.RemoteDesktopManager.Managers.SerializationManager.LoadObjectFromString(String str, Type type, Boolean createAnInstanceIfNotExists, String nameSpace)
at Devolutions.RemoteDesktopManager.Business.DataSources.BaseXmlConnectionDataSource.ReadXml(String content)
at Devolutions.RemoteDesktopManager.Business.DataSources.XmlConnectionDataSource.LoadData()
at Devolutions.RemoteDesktopManager.Business.DataSources.XmlConnectionDataSource.GetConnections()
at Devolutions.RemoteDesktopManager.Managers.ConnectionManager.LoadConnectionsFromDataSource(BaseConnectionDataSource connectionDataSource)