Action not found

For request 'GET /application-id/REST-api-key/data/Users?where=Users%5Bfriends%5D.objectId%3D%27XXXX-XXXX-XXXX-XXXX%27Users%5Bfriends%5D.profilePic.objectId%3D%27XXXX-XXXX-XXXX-XXXX%27'