Hi, Having problems with yum in Centos3 this is the error message: "rpmdb: Program version 4.2 doesn't match environment version error: db4 error(22) from dbenv->open: Invalid argument error: cannot open Packages index using db3 - Invalid argument (22) error: cannot open Packages database in /var/lib/rpm Traceback (most recent call last): File "/usr/bin/yum", line 30, in ? yummain.main(sys.argv[1:]) File "/usr/share/yum/yummain.py", line 163, in main (log, errorlog, filelog, conf, cmds) = parseCmdArgs(args) File "/usr/share/yum/yummain.py", line 75, in parseCmdArgs conf=yumconf(configfile=yumconffile) File "/usr/share/yum/config.py", line 155, in __init__ self.yumvar['releasever'] = self._getsysver() File "/usr/share/yum/config.py", line 285, in _getsysver idx = ts.dbMatch('provides', self.distroverpkg) TypeError: rpmdb open failed" any help would be appreciated..I have tried to uninstall yum but still get the error above.. Regards, John Fox..