Revolution CGI error

[callum brines]

Hi all

Just getting starting using Rev for CGIs on Mac OS X 10.4.6. I have  
followed Jacqueline Landman Gay’s invaluable CGI tutorial but when I  
run a simple script Safari returns an "internal Server error" and in  
the console I get the following message:

"kCGErrorRangeCheck: Window Server communications from outside of  
session allowed for root and console user only".

Stumped.

Any help much appreciated.

Callum