Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString nric]?

One of the arrays that you think contains only PatientInfo objects actually contains an NSString. So when you then write info. Nric it's asking that NSString for its nric property, which of course doesn't exist.

The actual error would be wherever you're mistakenly putting a string in the array (either copyListOfItems or listOfItems ).

Replace with the following code, you will know what exactly is going wrong in your code.

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