seems you try to use WeatherBug as your WeatherProvider without an API code. To you WeatherBug you have to register and get an API code. This code must be entered inthe wp-forecast adminn dialog.
Please try accuweather first, it is easier because you do not need an API code to use it.
Please try it with some other city. Maybe london or boston or something else that is found using the search dialog.
If this works try to search for Vostok.
Accuweather has several interfaces and the Dumont Station place seems not to be offered via the web api.