objective c - RestKit weird error -

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i have been , running restkit ios , feel great. but, have serious problem. trying use objectmapper in application. while test application single view controller works fine , able load data in array. but, try integrate existing application, crashes error ;

 *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[__nscfstring objectforkey:]: unrecognized selector sent instance 0x8b55e90'

i have core data datamodel have not used mapping until. code in both test application , existing app same. annoying same code works fine single view controller while same things not work integration. appreciated !

"unrecognized selector sent instance" means trying call method on object no longer existent in memory. first need find out object by enabling zombies in xcode.

then have make sure object persists long need it, e. g. make property of parent view controller.


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