I have always uploaded my albums directly to Smugmug from Lightroom, and have never had any issues... until yesterday. I chose to create a new Smugmug album from the Lightroom menu, added my pictures, and uploaded. Almost immediately, an error pops up that says "An internal error has occurred: ?:0: attempt to index a nil value." I created a new album, added completely different pictures, tried again, and the same result. Interestingly, I can add these same pictures to previously created Smugmug albums and push publish, and the action completes with no problem. So it is only happening with the albums I've tried to create since yesterday. I have completed all of the updates for Lightroom, with no new results. Does anyone know what to do??
There are two SmugMug plugins, one from SmugMug and one from Friedl. You'll probably get better support by contacting the developer directly. Do File > Plug-In Manager and scroll to the SmugMug plugin to find out which one you have.