Пару дней назад успешно заходил, а теперь та же самая ошибка, Whitelabel Error Page.
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Thu Aug 24 08:03:07 UTC 2017
There was an unexpected error (type=Internal Server Error, status=500).
result returns more than one elements; nested exception is javax.persistence.NonUniqueResultException: result returns more than one elements