Can you help me with this issue:

"invalid top directory at /usr/lib/perl5/5.8.8/file/find.pm line 592"

Here is my code:
Code:
#!/usr/intel/bin/perl

use strict;
use warnings;
use File::Find;

my $exec_cmd = "/home/luis.rojas/simplesim-3.0/sim-outorder ";
my $exec_swim = "/home/ITESM/spec95-little/swim.ss < /home/ITESM/spec95-little/inputs/swim.in";
...