The track I saved yesterday, displays correct, but when I try to export the track, the error message "Uncaught exception: invalid character in name" occurs and I can't see dth kml or gpx file of my track

If I change the name of the .btt file, with de bb media explorer, the error still remain.

When I open the Tracks saved, the name of the error track, seems to have a return before the name.

I use your last version 0.5.1, I attach the .btt file.
Could you help me?. Thanks in advance