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Could not endBackgroundTask

Im trying to reproduce what is explained in this blog, http://developer.blueearth.net/2011/12/02/quick-tip-clearing-up-ios-multitasking/ , It explains how to use NSTimer in the background.

The problem is that after 10 minutes I get this.

Can't endBackgroundTask: no background task exists with identifier 2b55e8, or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug

And then 4 minutes after the application terminated

Any idea what I can do wrong?

thanks

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2b55e8 doesn't look like a good id, but I could be wrong. In my application on iOS 6, they start with 1 and print as integers with this error message, and not as hexadecimal values.

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