Update: Sorry, I misread the question. Just remove the `qx`, it tries to run Dumper through the shell.
use Data::Dumper;
$out = Dumper($q);
Old and wrong answer:
It seems you're calling the script as a shell script. Either, call it with perl :
perl myscript.pl
or prepend the shebang line to the top of the script to tell your system what interpreter to use:
#!/usr/bin/perl
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,