[GRASS-dev] g_parser() ERROR

Hy list,
I've a problem with r.soils.texture (http://trac.osgeo.
org/grass/browser/grass-addons/raster/r.soils.texture) . In past and in
previous test It worked properly but now I've this message:
ERROR: Required
parameter <CLAY> not set:
Actually all input module are null (tested with
G_message("sand file:%", inputClay->answer) and I can't find where is my error.
I'm using grass 6.4.0 (svn) and ubunto 8.4.

I need help, indeed!

thanks

gianluca