problems with debian+gnome2.2+pgadmin3

hi there!

 

i'm having problems in a debian box running gnome 2.2

 

i´ve installed pgadmin3 and when i try to execute it at the console prompt ít gives me the following message "GTK cannot open display". if i try to execute it through the shortcut in the gnome desktop nothing happens (the application doesn't appear and no message is shown).

 

if someone could help me it would be great.

 

tks

 

andré