The error message didn't say which weapon it was but, by a process of elimination, I discovered it's the Feathered Bomb. It was fine when my Tier 1 pet battled the other day and Account Search says I definitely own it and it's in my armoury.
Hey - can you include the steps that you took that lead up to it?
It had been in my Tier 1 pet's battle set for weeks with no problem and I'd done a few battles with him. On the 6th I tried battling with him again and got that message.
I first did an Account Check for all weapons in his set and was told they were in the Armoury. When I removed the Feathered Bomb from the set everything was fine. It's still in my Armoury and registering as such in Account Search. (I was going to try removing all weapons from the set in turn but, luckily, the Feathered Bomb was first on the list.)
For some reason, the site stopped recognising the bomb as being in the set.
I think I had this happen to me not long ago.. but it was because I had a weapon too high of a tier for the pet in the set. Feathered Bomb is only T1, so that seems odd. Can you confirm there's no other higher weapons in the set?
All his other weapons are T1 like the bomb. I'd battled with him with the bomb in his set before the 6th with no problem.
Something I forgot to mention. I tried using the T1 set with my T11 pet and got the same message.
I think it was Esmeralda. I did challenge opponent, select pet, choose weapons. If you try to choose a set with a higher tier than the pet you get an error message here. I didn't get the message about not owning the weapon until I tried to start the battle. Will give it another try.
I put the bomb back in the set and everything is fine now. No problem at all.