What is this iOS error and where is it coming from?

StackOverflow https://stackoverflow.com/questions/17073827

Question

My friend's app is getting an error and I do not know what to do about it.I researched this error and I came across so many different answers, but none of them seems to work.Any help will be appreciated.

Terminating app due to uncaught exception 'NSUnknownKeyException', reason: 
'[<RootViewController 0xac80420> setValue:forUndefinedKey:]: this class is not key value 
 coding-compliant for the key optOutStatusSlider.'
Was it helpful?

Solution

Verify your references of your outlets in your XIB/Storyboard, one of them is probably referencing a property that does not exist anymore.

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