custom WU-forecast.php problem : Sorry.. this country forecast can not be proc

Suddenly today my weather page with custom script : $Version = "WU-forecast.php Version 1.10 - 22-Dec-2008
Shows the following message.

[color=red]Warning: Division by zero in /[root]/public_html/weather/forecast.php on line 422
Sorry… this country forecast can not be processed by this script.

Locations in the United States and territories should use the carterlake NOAA script.

http://www.arillas.com/page/en/weather/

Locations in Canada should use the Environment Canada forecast script.[/color]
I have not changed anything to my website anyone knows why this could be happening?

see the work done here