Miscellaneous: Weird error message - item deleted.

[Extunarian]

I have been able to reproduce this error. I have some screen shots of me picking up the items and putting them back to show the error message, but OP already shows it.

I did this twice as I thought the first time was a fluke and didn't think about it until it happened again. Basically I turned gnoll fangs into the female warrior guild trainer in halas who rewards you with a minor item per tooth. One of the items she gives is 'a ration', which I stacked in my inventory as she doled them out (I had a lot of teeth).

Anyway I went to the nearest merchant and started selling the torches, lamps, and other jun she had given me, but when I tried to sell all the rations I had at once, the merchant said 'hold your horses, one at a time' or something along those lines. I backed out of the merchant screen and tried again, this time only selling one ration at a time, but the client printed in red letters
'you seem to have misplaced this item.'
At that point I once again closed the merchant screen and tried to unstack the rations, which is when I started to see the message:
"Error: Server found no item in slot 255 (-> 30): Deleting Item!"

This happened to me twice, under the exact same circumstances. I ended up just destroying the items the first time, and the second time I logged in/out and the items were gone.