Error in superdev mode

My GWT application complied in 2.5.1 works well. But when I run this application in SuperDev mode. , it shows me error "was not assignable to 'com.google.gwt.user.client.rpc.IsSerializable' and did not have a custom field serializer." . I have verified that all java classes implement  Serializable . Every thing works great in DEV mode and in compiled mode. But nothing works in SUPERDEV mode because of this error. I am not able figure out what is cause of this error. Can anybody please hep me ?

My GWT version is 2.5.1.

Chrome version is  30.0.1599.69 m

Thanks in advance

Nagin Kothari

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