Have the addon. It was included in the installer.
The last Bforartists version that worked with Luxrender was Bforartists 0.9.2.
I haven’t really nailed it down. But the new Blender version from Buildbot fails at Luxrender too. With same error message. And i guess it’s the same cause.
The problem is, Blender does not fix external addons. You might need to contact Luxrender here to get a fix. Seems that an updated version of the script is required.