Why cannot my XML-fitting work in my serverless API pipeline??

[liusigou]

There is only XML fitting in my code but the output has a lot of necessary characters in output and there is an error in debug mode,

importScripts('https://eee-prod-ca-central-1-extensions-public-prodtestca.s3.amazonaws.com/all-accounts/Ellucian/data-connect-designer/4.27.4/worker-json.js');

input Json is following,

{
"student":
{ "name":
"John Smith",
"id": "100",
"courses": ["English", "Spanish"]
}
}

template is following:

${source.name} ${source}

output is following:
[
"",
"<Root",
">",
"<Student",
" id="100"",
">",
"<Name",
">",
"John Smith",
"",
"<Course",
">",
"English",
"",
"<Course",
">",
"Spanish",
"",
"",
""
]