Help! About d.mon

[Der-Johng Sun]

Why have below message?

GRASS 4.1 > d.mon x1
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  78 (X_CreateColormap)
  Serial number of failed request:  73
  Current serial number in output stream:  74
Please start graphics monitor <x1>.
Error - Graphics monitor <x1> not running!
Problem selecting x1. Will try once more
Please start graphics monitor <x1>.
Error - Graphics monitor <x1> not running!

Mapset <maps> in Location <botany>
GRASS 4.1 >                                    

Thank you!
r3206009 at cc.ntu.edu.tw