400.3 - User registration error

Error on user registration, it is not possible to register the user because an error, see errors field.

errors field has a list of key/detail pairs with the different errors, for example:

{
    . . .
    "errors": [
        { "key": "user_email", "detail": "Already exists an user with email address \"[email protected]\"."},
        { "key": "account_name", "detail": "Account name \"testaccountname\" has been already taken."}
    ]
    . . .
}