Question

cell.textLabel.text = operationEnt.operationNaam;

on this line of code I get the error:

 *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString operationNaam]: unrecognized selector sent to instance 0x6bce400'

But operationNaam is an attribute defined as a String. So I’m wondering, where is my mistake.
This is when I try to fill my cells of my TableView.

Answer 1

That exception means that the message operationNaam is being sent to a NSString object, and NSString does not recognize that message selector.

This means that your operationEnt object has somehow become a NSString during runtime.

Possibly, you did this…

operationEnt = someString;

when you meant this…

operationEnt.operationNaam = someString;