Receiving "API request's body is either missing or incomplete." error

Hi, I am attempting to call the Creator API V2 Delete Records function from a CRM function and receiving the error "

Below is a code snippet with some URL variables removed:

criteria = Map();
criteria.put("criteria", "(First_Name.contains(\"Test\"))");
messages = Map();
messages.put("message", true);
messages.put("tasks", true);
criteria.put("result", messages);
info criteria.toString();
response = invokeUrl [
url : "https://creator.zoho.com/api/v2/zoho_owner_name/creator_app_name/report/report_name"
type : DELETE
parameters : criteria.toString()
connection : "zoho_creator_auth"
];
info response;

When I info my criteria, it seems to match what the documentation says to provide:

{

"criteria":"(First_Name.contains(\"Test\"))",

"result": {

"message":true,

"tasks":true

}

Any suggestions?