Error 500 Internal Server Error

GET https://serwis.ehvac.pl/admin?crudAction=batchDelete&crudControllerFqcn=App%5CController%5CAdmin%5CCityCrudController&page=42

IP
10.0.1.2
Profiled on
Token
68cec8
Forwarded to ErrorController (36e74e)

Serializer

Nothing was handled by the serializer.