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What is a Type 17, 18, 19, 20, 21, 22, 23 24, 26, 27, 30 or 31 error?

Error Types 17 through 24, 26, 27, 30 and 31

Your Mac tried to access a standard routine in the System File, and couldn't find it. This usually indicates a corrupted System File. Install a fresh one to replace it.

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