Modpacks not launching

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Title:

Modpacks not launching

Launcher Version:

1.4.12

Modpack:

Sky Factory 2.5

Modpack Version:

2.5.0

Log Link:

http://paste.feed-the-beast.com/view/532e81a3

Details of the issue:

I have installed FTB & modpack from scratch which seemed to work fine, but the launcher just closes when I try to launch the modpack.

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