WebDynpro Java DC throwing build error after migration from 7.0 to 7.3

Hi

We have migrated WebDynpro java dc from 7.0 to 7.3, after migrating when we rebuild & build the DC, it is having build error.

NetWeaver Developer Studio 7.3 SP08 PAT0011

Error is coming in custom controller as:

[wdgen] [Error]ContextAttribute 'AAA.structureElement': All attributes of the corresponding context node have to be bound to fields of a dictionary structure Hint:Remove the corresponding attribute

[wdgen] [Error]ContextAttribute 'BBB.structureElement': All attributes of the corresponding context node have to be bound to fields of a dictionary structure Hint:Remove the corresponding attribute

[wdgen] [Error]ContextAttribute 'CCC.structureElement': All attributes of the corresponding context node have to be bound to fields of a dictionary structure Hint:Remove the corresponding attribute

[wdgen] [Info] Component //WebDynpro/Component:com.ab.psl.pp.misc.XXXComp could not be generated

[wdgen] [Error] Generation failed due to errors (9 seconds)

Please help in resolving the error.

Thanks

Akanksha