When starting up sweethome3d on Ubuntu Linux, with several of the plugins, I'm getting the message

Invalid plug-in jar:file:/home/apease/.eteks/sweethome3d/plugins/CopyAsNewFurniture.sh3p!/com%2Feteks%2Fsweethome3d%2Fplugin%2Fcopyasnewfurniture%2FApplicationPlugin.properties:
Not compatible application version

Could someone advise?