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copied!<p>David's answer is correct but I would advice reading up on your memory management. </p> <p>If you are synthesizing properties then it is a lot easier to use the getters and setters and let them do the memory management for you. The exception being in your init/dealloc methods where you should try to directly use the ivars to avoid any potential side effects of using the getters/setters.</p> <p>With the two lines david highlighted</p> <pre><code>seminareArray = [[NSMutableArray alloc] init]; // owned seminareArray = [NSMutableArray arrayWithCapacity:10]; // autoreleased </code></pre> <p>You could potentially use either if the memory management was done correctly.</p> <p>The first line on its own is correct as it creates an instance of <code>NSMutableArray</code> with a retain count of +1 then assigns it straight to the ivar.</p> <p>Then as David pointed out the second line replaces this with an autoreleased <code>NSMutableArray</code> so this line is superflous and crashes your program. The method <code>arrayWithCapacity:</code> is not simply setting the capacity of the array it is giving you a new autoreleased array.</p> <p>If you wanted to use an autoreleased <code>NSMutableArray</code> then you would need to use the setter either with dot notation of passing a message:</p> <pre><code>self.seminareArray = [NSMutableArray arrayWithCapactiy:10]; OR [self setSeminareArray:[NSMutableArray arrayWithCapcity:10]]; </code></pre> <p>By simply referencing things straight to <code>seminareArray</code> you are avoiding the getters/setters you synthesized and therefore are responsible for all of your memory management.</p>

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