emacs: Cannot connect to X server :0.0

From: wendy (xproe_at_yahoo.com)
Date: 07/30/04 

Date: 30 Jul 2004 11:27:08 -0700

I have a newbie problem on emacs also, in fact all the X window program.

When I want to use emacs to edit the existing file, I got the following error:
-----------------------------------------------
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified
 
emacs: Cannot connect to X server :0.0.
Check the DISPLAY environment variable or use `-d'.
Also use the `xhost' program to verify that it is set to permit
connections from your machine.
-----------------------------------------------
I can just open files with emacs one hour ago without doing anything.
Can someone help me with this?

Thanks
Wendy

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