[Zope] Newbie - Zope won't start

I downloaded and installed Zope for Linux as per the instructions at zope.org. When I try to start Zope with ./start & I get a report that it has started up on ports 8080, 8021, and 8099. Then I get this: Traceback (innermost last): File "/usr/zope/Zope-2.2.1-linux2-x86/z2.py", line 708, in ? pf = open(PID_FILE, 'w') IOError: [Errno 13] Permission denied: '/usr/zope/Zope-2.2.1-linux2-x86/var/Z2.p id' I installed it as root and am root when I issue the start command. This is a stock Red Hat 6.2 Intel box.