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NSArrayController trouble

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NSArrayController trouble

Subject: NSArrayController trouble
From: Alexander Cohen <email@hidden>
Date: Sun, 30 Nov 2008 16:35:24 -0500

Hi, Im getting the following line in the console when sending the 'removeObjectsAtArrangedObjectIndexes:' message to an NSArrayController instance.

-[NSCFArray removeObjectAtIndex:]: mutating method sent to immutable object

I understand what it means but i'm not sure why it's happening. Is there anything i need to set up in order for the contents of the arrayController to be mutable?

thx

AC
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