Description of Empty Arrays Error Message

This image shows the error message on the right side of the page. The message says:
Failed to generate XML schema from the JSON sample. This type of error generally occurs due to two reasons. Either the uploaded JSON was invalid or we could not construct XML schema from it due to the JSON sample having parameters not allowed in XML. The root cause for this particular failure was: Empty Array is not allowed in sample JSON.

To the left is the Select the response payload file section, with options for XML Schema and JSON Sample. Below this are the Chose File and enter Sample JSON sections. Below this is the Select the type of payload with which you want the endpoint to reply section. There are three options, XML, XML (text), and JSON (which is selected).