I wonder if anyone could help me out, i am kind of a beginner at QGIS. I´ve built a DEM for a project that i am developing than i´ve made the slope raster with the terrain analysis,it seemed that worked everything fine. But for further development of my work i ll need to vectorize some slope classes,but unfortunately every time i go Raster>Conversion>Polygonize; i get a error message (image with the error attached to this question). I thought that could be something wrong with the DEM that i ve produced.Just to check it i downloaded a DEM from ASTER DEM and i tried to do same with these and the same error occurs! Could be a software bug? Or am i doing something wrong? Or there is another way of doing this?

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    try to avoid non-ascii characters in the output file name. From that I can see you are naming the file to something like ..ECOLÓGICA... This should be the fastest way to solve. – lrssvt Dec 2 '14 at 20:00
  • @Irssvt - you were right, it was the name of the folder. i have change it for a simple name and it worked very well. Thanks a lot. It is really appreciated. Regards. Vitor – Vitor Pina Silva Dec 2 '14 at 21:28
  • @Joseph is there a way to convert a comment to an answer here? or should I simply to answer by pasting the above comment? – lrssvt Dec 3 '14 at 11:47
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    Apologies for being unclear @lrssvt. Yes, I meant copy/paste your comment (with some editing) into an answer. Then delete your comment. – Joseph Dec 3 '14 at 11:53

The problem is due to the presence of non-ascii characters in the path of the output file, so you just change the path name to something else that contains ordinary characters (e.g. UTF-8) and try again.

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