Small Rough Edge: itemlevel

For quite a while, I couldn't figure out how the /itemlevel command worked. I pointed my mouse at the item, so there was an item under the cursor. The error came back: There is no item under the cursor. What gives?

I eventually figured it out: I needed to pick the item up with the mouse.

The error needs to be: "You have no item picked up with the mouse" or something like that.