Can't open present box from Slime KQ

[lilywhite]

Just now I finished the "King Slime's Counterattack" KQ on Apoline, and got a present box as usual. But when I right-click to open it, I get the following message: "[Notice] Inventory is full, the box cannot be opened. An unidentified error code has occurred: 1812". This despite the fact that I have several inventory slots open.

I've done the same KQ a couple of times before with the same character, and never encountered this problem. Closing Fiesta and logging back in accomplished nothing.

A screenshot:

http://img.photobucket.com/albums/v444/linele/screenshot003ed.jpg

[_Rhen_]

haha silly it has to be at least 3 open slots^^

[Farashimisanoob]

Yeah, because some chests give 3 items.

[lilywhite]

I have two more open slots on the next inventory page, though.

edit: I tried it again this morning and it worked (without my changing anything). Perplexing.

[AlphaCentari]

Keep emptying your inventory until the box will open.