Error whilst uploading businesstransaction.xml E2E

Hi all!

I have recorded a transaction using the SAPClient plug in, and generated a business transaction.xml, I was wondering has any of you ever encountered this error: 500 Upload failed<br> Error message: com.sap.sup.admin.e2etrace.api.E2ETraceProcessingException: org.xml.sax.SAXParseException: cvc-minLength-valid: Value '\n\n' with length ='2' is not facet-valid with respect to minLength '3' for type '#AnonType_responseHeader'.

I am assuming there's something in this XML that requires to be 3 characters or more, and it isn't but I can't figure out what it is.

Tried searching around but nothing could be found assuming this: AnonType_responseHeader is the biggest clue.

Cheers!

Chris