This particular procedure entry point will be locatable in the perl-5.10.1 dll, but not in the perl-5.10.0 dll.
Ensuring that PAR was built for the particular build of Perl that you're using should eliminate this problem. But if PAR was built using perl-5.10.1, and you're using that PAR with perl-5.10.0, then you can expect an error like that.