App is crashing due to core data model

I am following the below tutorial to get my hands o开发者_JAVA百科n using core data model.tutorial link here

I have done what all said in it but I get crash from the app. please find the log below

LapTimer[3270:207] -[TimeTableController setEventArray:]: unrecognized selector sent to instance 0x4d114f0
2011-07-13 15:11:32.369 LapTimer[3270:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[TimeTableController setEventArray:]: unrecognized selector sent to instance 0x4d114f0'

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Very simply you're trying to call the method setEventArray: which TimeTableController doesn't support. The most likely reason is you're trying to assign a variable called eventArray that doesn't exist or hasn't been synthesized.

Check your array is called eventArray and has been synthesized in your implementation file (the .m file).

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Check if you synthesize the variable in .m file,

@synthesize managedObjectContext, eventArray;   

and also declare in the .h file,

@property (nonatomic, retain) NSMutableArray *eventArray;