Ftb launcher crashes when launching pack

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Title:

Ftb launcher crashes when launching pack

Launcher Version:

1.4.7

Modpack:

regrowth

Modpack Version:

1.7.10

Log Link:

http://paste.feed-the-beast.com/view/2d6ec58f

Details of the issue:

When clicking on regrowth pack it gets as far as the mojang screen and closes with no error message. other packs so far work fine.

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