This error occurs when attempting to import .obj files:
[java]Unknown statement in OBJ! o[/java]
The .obj files in question were exported using Blender 2.69 and/or Wings3D 1.5.2, and both .obj files produced contained the line
o filename_here
where the filename is the name of the mesh being exported. This syntax is currently the standard naming procedure for .obj files, as described under ‘Referencing materials’ at ..OBJ Wiki:
Named objects and polygon groups are specified via the following tags. o [object name] ... g [group name] ...
A temporary fix is simply to delete or comment out the offending line in the .obj file, as that seems to make it load without error (for a single object, anyway–more testing required). A quick fix for the importer would be to ignore/skip over the line starting with the ‘o’ statement.