I am using below code to compare 2 different XML files but I am getting below error

1..1
Entity: line 1: parser error : ParsePI: PI xm space expected
<?xm="UTF-8"?>
    ^
# Looks like your test exited with 255 before it could output anything
+.
[download]

Please suggest me what can be wrong in the script.

use strict;
use warnings;

use Test::More tests => 1;
use Test::XML::Ordered 'is_xml_ordered';

my $parser1 = XML::LibXML->new();
my $expected = $parser1->parse_file( $ARGV[0] );
my $parser2 = XML::LibXML->new();
my $actual = $parser2->parse_file( $ARGV[1] );

is_xml_ordered(
    [string => $actual],
    [string => $expected],
    {},
    'Test $got_good'
);
[download]

Entity: line 1: parser error : ParsePI: PI xm space expected
<?xm="UTF-8"?>
    ^
[download]

Please suggest me what can be wrong in the script.

From the error message it seems pretty clear to me that your input file is malformed. A typical first line of an XML file would be <?xml version="1.0" encoding="UTF-8"?>.