[Zope] error message PANIC(300) at startup

When I try to start Zope-2.5.1 (after an installation without any error message on linux) I got the following error-message: PANIC(300) z2 Startup exception Traceback (innermost last): File /usr/local/etc/Zope-2.5.1.-linux2-x86/z2.py line 690, in ? IOError:[Errno 13] Permission denied: '/usr/loca/etc/Zope-2.5.1-linux2-x86/var/Z2.pid' When I have a look at the directory Zope-2.5.1-linux2-x86/var/ the Z2.pid is missing... what can I do ? Thankx