Unifier api to list all folders always gives 500

Question

-- I had been trying to use this Unifier API get list of folders. /ws/rest/dm/node/properties

Always get the following response

{
  "data":
  [
  ],
  "message":
  [
  ],
  "status":500
}

Not sure what needs to be done to get it correct. I do not have any access their support page as well.

Primaver unifier API.

Expecting to list all folders from unifier and also download those folders/files using Unifier API.