Sure. I don't know what you've done to your script, but here's one which runs to completion and gives no such error message.

#!/usr/bin/env perl 
use strict;
use warnings;

use YAML qw/LoadFile/;

open my $fh, '<', '/dev/null';
my $config = LoadFile ($fh);
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Examine this code and compare it to your code. Start altering this code one line at a time to make it ever closer to your code, running it after each addition. If you hit a problem you will then know precisely which change caused the problem.

This code works fine for me.

use strict;
use warnings;
use YAML qw(LoadFile);
use Data::Dumper;

# step 1: open file
open my $fh, '<', 'config.yml' 
  or die "can't open config file: $!";

# step 2: convert YAML file to perl hash ref
my $config = LoadFile($fh);
print Dumper($config), "\n";
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Although I have my doubts this is the reason, you could try upgrading your YAML.

Note that YAML's own documentation recommends switching to YAML::XS.

That's probably the best choice, thanks for you input.

Are you really getting this error?

"Undefined subroutine &main::LoadFule called at test.pl line 18."

Sorry, that's a typo.