Hi Ivan, how did you install Shapely? The version you get using the OSGeo4W installer has always worked for me. Nick. -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Polygonizer-plugin-2-1-install-error-tp5044829p5044946.html Sent from the Quantum GIS - User mailing list archive at Nabble.com.