PCX View, d.mon

Hi!
I try to run grass4.1 on a UNIX workstation using
a PC with PC-XView.
When I try to open the monitor
d.mon start=x0
I get,
X Error of failed request: BadMatch (invalid parameter attributes)
  Major opcode of failed request: 78 (X_CreateColormap)
  Serial number of failed request: 25
  Current serial number in output stream: 26
Any help?

PLEASE REPLY TO alobo@eno.princeton.edu
or alobo@u.ija.csic.es
NOT TO THE LIST

Thanks!

Agus