In taking a look at the XML file you will see what has been output by AutoCAD C3D is not valid. The clue is in the error as it provides line and position.
File 'or-1m.xml' is not even a valid LandXML file and has been manually edited.
However the other supplied files are valid formats but with other errors. Specifically it looks like a non English OS issue with output including invalid / unsupported characters.
<Project name="D:\?…å®®\?–å¡«?ŸçŸ³?¹è?算工作æ?1020601.dwg"></Project>
<Surface name="des1m" desc="?è¿°">
Perhaps we can trap and possibly ignore in some cases so it does not crash but for now I would suggest not manually editing LandXML file unless proficient with XML formatting and for non English OS's that there is potentially a limitation for element naming with unsupported characters.
Regards
Ian