FTB Infinity won't launch

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Title:

FTB Infinity won't launch

Launcher Version:

1.4.7

Modpack:

FTB Infinity

Modpack Version:

v1.5.1

Log Link:

http://pastebin.com/zxhsaUtB

Details of the issue:

Whenever I click launch, Minecraft doesn't open. The error in the console says: [main/ERROR]: Unable to launch

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