Elmer Marques

I download the new version of FreeMind, but since then I can't open the files I had saved before using the old version. It shows up this message: Error while parsing file:freemind.main.XMLParseException: XML Parse Exception during parsing of a map element at line 1: Expected: = Could someone please help me to sort this out? I'm not an IT professional, so I'm completely lost. It's very important for me to get my mental maps back for professional purposes.