[Can't open modpacks?]

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[Can't open modpacks?]

I can't get any modpacks open. The launcher will load the pack, close and then reopen the launcher. I have 64 bit java, what should I do? I will post the logs on pastebin and leave a link 

 

Pastebin: http://pastebin.com/vV0PjYV5

[Can't Open Modpacks?]

Thank you so much

[Can't Open Modpacks?]

Log: http://pastebin.com/2Bu3v2kv

[Can't Open Modpacks?]

Whenever I try to open any modpack, including original technic modpacks, it begins installing the assets. Then the launcher closes and immediately reopens to the same page, though the installing assets bar has disappeared. How can I fix this?