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I managed to break my Messages install trying to get it to work on my MacBook Air by deleting Library files that worked with it. Now when I try to open messages I get the error

An internal Messages error occurred.

There was a problem with Messages. You need to quit and open Messages again.

Can I just copy Library files from another one of my computers running OS X? Or is this the sort of thing that I need to reinstall the OS for?

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Yes, copying the files from another computer should be fine, providing both computers have the same version of Messages.

There is a certain amount of leniency with this though, depending on where the files are that you deleted. For example, files in your home folder are expected to be backward-compatible since if you've upgraded your OS then it must know how to update the files.

Also, once you've copied the files, make sure you set the permissions correctly…

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