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open my $input, '<', "my_input.xml" or die "Can't open my_input.csv: $
+!"; # Whoops, my_input.xml does not exist by my_input.csv file does

my $input_file = "my_input.xml";
open my $input, '<', $input_file or die "Can't open $input_file: $!"; 
+# Still doesn't work but the error message is correct

my $file = get_file(); 
my $folder = get_folder(); # The function returned an empty string by 
+mistake
...

my $input_file = "$folder/$input";
open my $data, '<', $input_file or die "Can't open $input_file: $!"; #
+ You'll see straightaway that you the folder is empty