My modpacks wont load

[screecher02]

none of the modpacks i install will load it will install then when i go to play it says loading minecraft assets then will close the launcher and open it again

[plowmanplow]

One must provide details about which pack you are trying to launch (and don't say "all of them", give a specific example) along with the /logs/fml-client-latest.log and /crash-reports/<most-recent-file> in a pastebin service before we can help you.