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"))
if len(self.selected) == 0:
inkex.errormsg(_("No object selected. Please select the object you want to assign an effect to and then press apply.\n"))
for id, node in self.selected.items():
if (self.options.effectIn == "appear") or (self.options.effectIn == "fade") or (self.options.effectIn == "pop"):