Implementation could not be updated

Hi,
I am currently trying to develop an application which interacts with BAPIs.
It was working perfectly fine earlier on.
Then i went and changed the BAPI and re-imported the model.
After that my component controller implementation is giving me errors like "IPrivateReqApp cannot be resolved".
(Where IPrivateReqApp is my comp ctrler)
Along with this, an error comes in Task bar stating that "The implementatio could not be updated since there are errors (See Task List)".
And when i look at this task list, it shows the missing IPrivateReqApp etc etc errors....
I tried rebuild and repair and everything that could be done but these countless errors are not going.
Also, a folder by the name "wdp" used to form in com\sap\<application name> but now its not!
Can anyone suggest where am i going wrong?
Regards,
Dev

Try with this option:
1. Delete all the three folders - gen_wdp, gen_ddc, gen
2. Click on top root=>Develeopment Component=>Rebuild...
Thanks,
JSP

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