pgaccess installation trouble

[NitzGuy]

Hello,
I am trying to install pgaccess on a redhat 7.3 linux server. Everything seems to be alright but when I go to run pgaccess I get an error message saying

Application initialization failed: no display name and no $DISPLAY environment v
ariable
Error in startup script: invalid command name "image"
while executing
"image create bitmap dnarw -data {
#define down_arrow_width 15
#define down_arrow_height 15
static char down_arrow_bits[] = {
0x00,0x80,0x00,0x80,0x0..."
(file "/usr/local/pgaccess/main.tcl" line 5)

Can anyone Offer any advice on this problem?

Thanks In advance
Jason Fournier