oops, there is a bug in that part of the code that causes it to fail silently (instead of failing with an error that tells you what has gone wrong).

Try replacing it by the following version:

sub _load_module {
    my ($module, $version) = @_;
    $loaded_module{$module} ||= do {
        do {
            local ($@, $SIG{__DIE__});
            eval "require $module; 1"
        } or croak "unable to load Perl module $module";
        1
    };
    if (defined $version) {
        my $mv = do {
            local ($@, $SIG{__DIE__});
            eval "\$${module}::VERSION" || 0;
        };
        (my $mv1 = $mv) =~ s/_\d*$//;
        croak "$module version $version required, $mv is available"
            if $mv1 < $version;
    }
    1
}
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