winless does not compile into css-folder

[Lissy01]

I am using winless with windows 7 and modifying a bootstrap theme.
When i am changing a less-file the compiling of style.less is correct, but not in css folder but in the same folder (less).
My folder i wrote into winless is C:\wwwroot\less\monless and under this folder there are the folders less and css.
Where is the error?