-----Original Message----- Dear All, I tested the r.sim.water example posted on http://trac.osgeo.org/grass/changeset/36660 and again get the same error as posted on http://n2.nabble.com/r.sim.water-td2603201.html#a2603201 r.sim.water works fine on ubuntu grass version 6.2.3 Cheers Floris