R: rulefit error on Linux

R version 2.8.1 (2008-12-22) on Linux 64-bit

I am trying to run 'rulefit' function (Rule based Learning Ensembles). but I
got the following error -

rulefit(x,y)

Warning: This program is an suid-root program or is being run by the root
user.
The full text of the error or warning message cannot be safely formatted
in this environment. You may get a more descriptive message by running the
program as a non-root user or by removing the suid bit on the executable.
xterm Xt error: Can't open display: %s
xterm:  DISPLAY is not set
Error in file(file, "r") : cannot open the connection
In addition: Warning message:
In file(file, "r") :
  cannot open file '/root/_rulefit/rfstatus': No such file or directory
------------------------------

On windows R 2.10, I got this run successfully. So I am wondering whether it
is due to my R older version on Linux.

Thanks!

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