请教问题，急急急~[{0}] of class [{1}] with value [{2}] must be unique]

[ERROR] 2011-12-29 11:07:10,556 controller.InterfaceController org.springframework.validation.BeanPropertyBindingResult: 1 errors
Field error in object 'PMServer' on field 'address': rejected value [192.168.50.247:9008]; codes [PMServer.address.unique.error.PMServer.address,PMServer.address.unique.error.address,PMServer.address.unique.error.java.lang.String,PMServer.address.unique.error,PMServer.address.unique.PMServer.address,PMServer.address.unique.address,PMServer.address.unique.java.lang.String,PMServer.address.unique,unique.PMServer.address,unique.address,unique.java.lang.String,unique]; arguments [address,class PMServer,192.168.50.247:9008]; default message [Property [{0}] of class [{1}] with value [{2}] must be unique]
请问这是什么问题啊，怎么解决啊，谢谢了~