Flutter Unit Test Report can't configurated

Hi team, I’ve following to flutter test report document from Bitrise but haven’t saw the test report add-on. In flutter test step already export xml file.But in step deploy to bitrise it get fail when upload test result like this.

i don’t understand why it get error while parsing but this is xml file that generated by Flutter Test so please help me with this one

But i run and copy this xml file and convert with this website to json is working
Best XML to JSON Converter Online to convert XML to JSON String, URL and File.

Not sure why ?