AttributeEditorXML.exe Error: 0: Error loading settings C: \ Users \ cookbros \ AppData \ Local \ SEGA \ Relic Entertainment \ Company of Heroes 2 \ Attribute Editor \ Settings.xml: Error deserializing object "of type AttributeEditorXML.Settings" , '.', hexadecimal value 0x00, is an invalid character. Line 1, position 1.
and
e = System.InvalidOperationException: Error in the XML document (0,0). ---> System.Xml.XmlException: The root element does not exist.
at System.Xml.XmlTextReaderImpl.Throw (Exception e)
at System.Xml.XmlTextReaderImpl.ParseDocumentContent ()
at System.Xml.XmlReader.MoveToContent ()
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderLayoutRoot.Read9_LayoutRoot ()
make it seem like either something got messed up with your .xml file or the settings of the Attribute Editor. Have you tried verifying cache of the tools?

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