Problem with pgaccess

Hi  , i am novate in postgres and i want run de pgaccess but when i run

bash$ pgaccess

return the follow errors

Xlib: connection to "0.0" refused by server
Xlib: Invalid MIT-MAGIC-COOKIE-1 key
Application initialization failde: couldn't  connect to display "0.0"
Error in startup script: invalid command name "image"
.
.
.

when i redirect de Display with

bash$ export DISPLAY=<hostname>:0.0;

where hostname is my machine.   The same error.

2. When a run pgaccess with other user not postgres, isn't load
"libpgtcl.so": /usr/lib/libpgtcl.so

and the libray is there.

Can you help me.

Thanks

Hector Morales
Guatemala C.A.