[Gvsig_english] derive centroids from polygon theme

[Christian Brandt]

Dear list,
using the Sextante function <centroids> within gvsig 1.9 portable version on a polygon theme results in the following error message:

Es.unex.sextante.exceptions.GeoAlgorithmexecutionException

Is this a bug or are there any ideas how to "check" the polygon theme in terms of possible errors (e.g. unclosed polylines, although this should not matter with this function).

Best wishes

Chris
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