[Zope] [Q] Error - StorageSystemError

I installed/deinstalled zope-2.3.2 several times everytime I get this error message. File /usr/local/zope/2-3-2/lib/python/Zope/__init__.py, line 110, in ? File /usr/local/zope/2-3-2/lib/python/ZODB/FileStorage.py, line 264, in __init__ File /usr/local/zope/2-3-2/lib/python/ZODB/lock_file.py, line 101, in lock_file StorageSystemError: Could not lock the database file. There must be another process that has opened the file. <p> I could not login to the server by telnet. And then boot the system as "linux single", and deleted zope, and re-boot, and reinstall it. I really do not know what to do. Please help me out. Thanks. Joo-yung