inkex.errormsg(_("The JessyInk script is not installed in this SVG file or has a different version than the JessyInk extensions. Please select \"install/update...\" from the \"JessyInk\" sub-menu of the \"Extensions\" menu to install or update the JessyInk script.\n\n"))
# Remove old mouse handler
for node in self.document.xpath("//jessyink:mousehandler", namespaces=inkex.NSS):