Windows- After Log-in launch failure
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Goldnkiller
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Once I run World of Minecraft it asked to download a minecraft.jar, I did so, it opened the World of Minecraft launcher where you log-in and i wanted to choose single-player, I hit single-player and it says exactly this.

Fatal error:
  Error launching World of Minecraft client:
  java.lang.ArrayIndexOutOfBoundsException: 0
I tried reinstalling.

notacoolnamehuh
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not sure, but

If I were you I would delete all of the files and re-install.

killinUstoned
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I got the same thing... :/

I got the same thing... :/

Doomsday2012
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same here

Mhmm...