[Zope] CLIENT_HOME

All of a sudden at starting a Zope instance, I get this error message on the console: File "/usr/local/zope/z2.py", line 476, in ? zdaemon.run(sys.argv, os.path.join(CLIENT_HOME, Zpid)) NameError: name 'CLIENT_HOME' is not defined It worked before. I installed some CMF Content types and stuff, but can't remember changing anything above of the Products directory. Stephan