On 4 May '08, at 3:35 PM, Steve Steinitz wrote:
Cannot remove an observer <NSTableBinder 0x158a70> for the key path "name" from <Alternative 0x15abd0> because it is not registered as an observer.
"It" refers to the observer. -removeObserver:forKeyPath: raises this exception if told to remove an object that isn't currently registered as an observer. So what's happening is that a table view is trying to unregister as an observer from one of your objects that it unfortunately didn't previouly register as an observer for.
The usual cause of this is that you have a property that isn't KVO- compliant. Something accesses your 'foo' property and registers as an observer of that property, and also as an observer of the object that's the property's current value; you change the value of 'foo' without letting anyone know; the observer then later decides to stop observing, gets your 'foo' property, and removes itself as an observer of that object. But it's no longer the same object that it registered as an observer for...
—Jens
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