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if a response that is an XML document  I'm trying just to get just one child node
```var xmlDocument = xml.Parser.toString({
text: xmlString
});
var labelkNode = xml.XPath.select({
node: xmlDocument,
xpath: '//label'
});```

you need to share the error code/message for these kind of things

stack trace is especially helpful so you know which line is causing the error

```{"type":"error.SuiteScriptError","name":"WRONG_PARAMETER_TYPE","message":"Wrong parameter type: node is expected as xml.Node or subclass. ","stack":["Error"," at Object.beforeSubmit (/SuiteScripts/Shipglobal.js:189:27)"],"cause":{"name":"WRONG_PARAMETER_TYPE","message":"Wrong parameter type: node is expected as xml.Node or subclass. "},"id":"","notifyOff":false,"userFacing":true}```

<https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4344924195.html|Parser.fromString> changes a string into a xml document

<https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4344924636.html|Parser.toString> changes a xml documents into a string

the response i get is an xml document i want to just get the data  inside &lt;label&gt;&lt;/label&gt; node

i am making an api call the response is an XML document or string with XML inside ?

this was the respone
```&lt;?xml version="1.0"?&gt; &lt;FFUSACourier&gt;&lt;Shipment&gt;&lt;Result&gt;Success&lt;/Result&gt;&lt;TrackingNumber&gt;FFUSA247134&lt;/TrackingNumber&gt;&lt;Label&gt;PGhlYWQ+ID ......```

are you using <https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4314733286.html|ClientResponse.body>?

look at the return type of the documentation i linked