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This question already has an answer here:

I have Android 4.1.2 on Samsung galaxy S2

I install an app and get this error:

unknown error during appliaction install -24

googling this line should clearing Google play cache might help

but it didn't work for me. Any other solution?

marked as duplicate by eldarerathis Sep 13 '14 at 19:56

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Why do you need another solution? Doesn't clearing the cache solve the issue? That's the least dangerous thing to do. Of course, a factory-reset might help as well, but that's like using a sledgehammer to crack a nut. – Izzy Nov 9 '13 at 13:50
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I've just checked that again: "Error -24" in most cases is caused by a failed install/update. To solve it, uninstall the app from your device. After that, you should be able to install it again.

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