That says that $sth is undefined. In the line:     my $sth = $dbh->prepare($sql); the right hand side is evaluating to undef. Either prepare() is failing, or $dbh itself is undefined. Try adding a die clause:

    my $sth = $dbh->prepare($sql)
        or die "No sth: '$DBI::ErrStr'", $!;
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With luck, you'll get something telling what the database doesn't like.

Do you see a pattern forming here? Always check for errors when you go to the system!

After Compline,
Zaxo