Most likely the path to your Perl interpreter is
incorrect. This means that the line:
#!/usr/bin/perl
located at the top of your perl file, needs to be
changed to the correct path. This is often:
#!/usr/local/bin/perl
or
#!/usr/local/bin/perl5
If you absolutely can't find it, try using the
following command or mailing your system
administrator.
which perl
This will give you the location of the perl
program if it is in your path.