OBJ fails

[spectrumgomas]

Hello. I installed Zoxel version 0.5.0 in Fedora 20. It works very well, excellent program. But:

File -> Save As -> OBJ Files fails and raises the following error:

'ascii' codec can't encode character u'\xe1' in position 29: ordinal not in range(128)

I've tried with different models and it always fails.