open (my $myfile, "$i") or die...
open (my $myfile, "<$i")or die... #no space after <
open (my $myfile, '<', "$i") or die...
take your pick...

##</code><code>##

open (my $myfile, "$i") or die...
open (my $myfile,  $i) or die...
open (my $myfile, "<$i")or die... #no space after < required
open (my $myfile, "<  $i")or die... 
open (my $myfile, '<', "$i") or die...
open (my $myfile, '<',  $i) or die...
\$i is wrong above....