xcreensaver时出现:xscreensaver: Can't open display: :0.0是怎么回事?

macman

屏保时出现如下信息:
xscreensaver: Can't open display: :0.0
xscreensaver: running as chen/chen (500/500)

xscreensaver: Errors at startup are usually authorization problems.
              But you're not logging in as root (good!) so something
              else must be wrong.  Did you read the manual and the FAQ?

              http://www.jwz.org/xscreensaver/faq.html
              http://www.jwz.org/xscreensaver/man.html
请问::0.0是什么意思?该怎么改正?


在ROOT下也出现类似的文字