[Validator] UniqueEntityValidator not compatible with the non-BC 2.5 Validation API #11578
Description
UniqueEntityValidator is not compatible with the non-BC 2.5 Validation API because addViolationAt method is used (line 139).
This exception is thrown:
addViolationAt() is not supported anymore as of Symfony 2.5. Please use buildViolation() instead or enable the legacy mode.