issue fixed. Please update plugin. https://plugins.qgis.org/plugins/undoPropertiesChanges/version/1.1/ Regards. Enrico Ferreguti -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Python-error-message-version-2-6-mac-os-x-tp5172756p5172813.html Sent from the Quantum GIS - User mailing list archive at Nabble.com.