dieuwerkeunen wrote:I tried to post this just a while ago but my post just vanished!
Your post did not vanish. It was "waiting for approval", as you are a new user.
This is the method used to tell real users from spammers.
The nil result probably means missing data for the calculation.
In order to WR to work you must have:
1) wind forecasts covering the area
2) polar data
In your case, the missing winds are probably the cause of failure.
Make sure you have version 2.35 (with the latest jan/15 GFS changes)
and proper configuration (see the wiki)