Either it errored out and you didn't see it, or you need to install it again. If this is the case, do the following:
perl -MCPAN -e shell
force install DBIx::Password
this should clear that problem up.
However, another reason may be that you have an old version of perl running (less than 5.6.1) or that you have two installs of perl running on the same machine. Check your package managers, and expect problems if you have both a package manager version of perl and a compiled version from the source.
Also, you may have two versions of Apache running, and/or two versions of mod_perl running, or mod_perl is old.
Your DBIx::Password package is not installed (Score:1)