If all you're telling is true, the only explanation is that ../frame.txt is an empty file. Note that it is a good practice to mention the filename as well. Also, it is a bad practice to use relative filenames unless you know which directory is the current directory when your script is run. Notably, webservers set a different current directory when they run scripts. The following code works for me, but it is not substantially different from your code:

#!/usr/bin/perl -w
use strict;

#my $filename = '../frame.txt';
my $filename = $0;
open my $fh, '<', $filename
    or die "Couldn't open '$filename': $!";
while (<$fh>) {
    print "$_\n";
};
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