Is it possible to disregard "Invalid Target" error?

[wowpup79]

I was wondering if you can use/cast an item without being stopped by the Invalid Target Error.
The item I found is like a bandage item used to heal certain npcs in Pandaria, so what I'm trying to do is use this on non-pandaren targets, including myself.
Not all the time I am by a healer when I am farming mats for professions.

Is it possible to have the game ignore the error message and use the item anyway? Or one of these messages, "you are in the wrong zone" etc.

[dnawlols]

I have this in an addon so it's run everytime but you can get rid of the error text with:
/run UIErrorsFrame:Hide()