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I am trying to use the "Delete part" tool on a shapefile. While I am starting to use it, an error message shows up : "Could not snap segment. Have you set the tolerance in Settings > Project Properties > General?". I tried to set different tolerances in the snapping options, the error still shows up and I can't delete any part of my polygon. How to fix that?

I use QGis 1.8.0-Lisboa and Windows 7.

Thanks

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    what snapping units have you set?are they set in map units or pixels? – vinayan Jan 16 '13 at 2:57
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Thanks. I fixed my problem. I had set the snapping unit in map units, I found the right setting for my shapefile in pixels.

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