Que signifie cette erreur de démarrage de Spring Boot ?
2016-07-04 21:53:53 [restartedMain] ERROR o.s.boot.SpringApplication - Application startup failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name org.springframework.boot.autoconfigure.session.SessionAutoConfiguration$SessionRepositoryValidator': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: No session repository could be auto-configured, check your configuration (session store type is 'null')