Invalid Location Provided

I'm using RocketTheme's RokWeather extension on a Joomla 3.4.1 site. I have created a module and placed it on the home page. The module is working with Yahoo! weather (it gives you two options: Yahoo! or WU), but when I choose WU and enter my API key it throws the error "Invalid Location Provided" on the home page where the module loads. I have changed weather locations to cities I know you cover (ex. Los Angeles, CA). Any Ideas?