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    Can't use string ("1") as a subroutine ref while "strict refs" in use 
+at $HOME/local/perl/lib/perl5/site_perl/5.12.3/Parallel/ForkManager.p
+m line 561 (#1)

(F) Only hard references are allowed by "strict refs".  Symbolic refer
+ences are disallowed.  See perlref.
  2. or download this
    use strict;
use warnings;
...
}

$pm->wait_all_children;