[GRASS-user] create raster from line vector

[G. Allegri]

Hello everyone.
A simple question, but I'm getting mad with it!
I simply have to convert a vector line to raster. I've done it many
times in the past, but this time I can't make it work:

v.to.rast input=border output=border use=val type=line layer=1 value=1

The output is simply blank (MAX and MIN values are NULL)
What stupid error am I doing?

Giovanni