[Mod edit] Corrected tags.
It’s my understanding that they went through a ton of stock recently because of their newly launched Bird Feeder. One of the employees said they are working on getting new stock for some things, including adapters, etc., so I am sure they have a new shipment order for solar panels on the way.
Thanks for confirming, It’s a crazy error message for something that’s just out of stock. You would think the computer will assign the right message…