Error:SingleFieldIdentity

Can anybody please tell me the cause of this error:--

A开发者_Go百科n object of class "entity.pendingRequest" uses SingleFieldIdentity using the field "empId" yet this field has not had its value set! Either set the field manually, or set a value-strategy for that field.

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From the sound of it, you've designated empId as your primary key, but haven't supplied a value, or told it how to generate one, before attempting to store a recored.