Help with Apple Numbers "stock" function.

Hi. I want to use the "stock" function in a Numbers spreadsheet, in this instance to report the current price of Nestle, a company listed on the Swiss stock exchange. As you can see from the image below, I'm getting the red triangle error when I try to use the function. Am I somehow using it incorrectly?

FYI the "stockh" function is working fine for me. Thx.