Minecraft Failed to launch!?

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I've had minecraft for awhile, and I want to update it to 1.0. Upon trying I get a 'Failure to Launch Screen' that says: Fatal Error Occured (4): ...show more
Update : ALso I have a Mac.
Best AnswerAsker's Choice
You can make a backup of your texture packs and too many items and then if on PC computer click the start button and then in search, type %appdata% then go to .minecraft and delete your bin folder then start minecraft. on mac go to finder, library then application support then minecraft and delete your bin then it should work!

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5 out of 5
It totally worked! You rock!
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