Add some error checking to
my $outfile = new IO::File(">test.xml");
If it fails, you'll be passing
OUTPUT => undef
to the XML::Writer constructor. It looks like XML::Writer defaults to STDOUT in this case.
This would cause your script to emit XML before it's emitted a header, which would cause the error you're seeing.
Props to VSarkiss for prodding me to take a second look.
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