xterm cant see what i write :-)

[Konne <bridge_stone@gmx.net>]

hi
my xterm has only a lack background, i tried to change the color but no 
change... but the xterm works... only i cant see what i write...
so i installed mrxvt, another xterm prog, and when i start that one me 
occurred following error..

mrxvt: can't determine colour: Black
mrxvt: can't determine colour: Black
mrxvt: aborting

some ideas?

sers