error when creating a new user through SAPS dashboard

[thiagomanel]

Amanda Calatrava, from UPV is facing below error when trying to create a new user
{"data":null,"status":-1,"config":{"method":"POST","transformRequest":[null],"transformResponse":[null],"jsonpCallbackParam":"callback","url":"http://xpto:8091/users?register","data":"userEmail=amanda%40amanda.com&userName=amanda&userPass=xpto&userPassConfirm=xpto&userNotify=no","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json;charset=utf-8"}},"statusText":"","xhrStatus":"error"}