wunderground plug-in not finding a city - Pigeon Forge, TN

I have been given the task of creating several pages, each with the weather using Wunderground plug-in. I have the shortcode that is working for Gatlinburg (see page and shortcode below): http://inboundtrain-station.com/heysmokies/weather-gatlinburg/

This one works for Gatlinburg:
[wunderground forecast location="Gatlinburg, TN " caption="Weather for Gatlinburg, TN" measurement='C' todaylabel="Today" datelabel="date('m/d/Y')" highlow='%%high%%°/%%low%%°' numdays="7" iconset="Incredible" class="css_table_class" cache="true" width="100%"]

However, it doesn't work for Pigeon Forge, and I can't find a reason why. Can you help?
This is the shortcode for Pigeon Forge:
[wunderground forecast location="Pigeon Forge, TN " caption="Weather for Pigeon Forge, TN" measurement='C' todaylabel="Today" datelabel="date('m/d/Y')" highlow='%%high%%°/%%low%%°' numdays="7" iconset="Incredible" class="css_table_class" cache="true" width="100%"]

and this is a link to the page:
http://inboundtrain-station.com/heysmokies/weather-pigeon-forge/

It says that it cannot find the location, and I can't figure out why.

Thank you so much!