Bishop error -- selling potions

[Bitcrunchr]

Temple Hall
Obvious exits: north, south, east, west
Temple Chapel
Also here: bishop.
Obvious exits: east
[HP=696]:sell 2 orange
Error processing command! Please report this in the forums.
[HP=696]:sell orange potion
You don't have orange potion to sell!

[I had 2 orange potions before]