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I'm having trouble with getting the Direwolf20 1.6.4 pack version 1.0.10 to load. after i click launch it just closes the launcher and nothing happens. Does anyone have a solution?
Head on over to the Direwolf20 modpack bugs thread and follow their directions.
But before doing that, I'd suggest a clean install. Take a backup of your world, then delete everything related to FTB, and start fresh, even the launcher.
Start a new world and if that works, you can then inject your save file back in and continue where you left off.
You should update your pack version to version 1.0.11 at least. v10 had been removed because DW20 accidentally left certain worldgen enabled when he added calclavia core. Also there is a bug with how power is converted in MFFS and certain upgrades in it are buggy too so be aware of that (unless you manually update it, which isnt supported).
Always check changelogs before updating your packs. Sometimes important things are fixed/removed/added/changed. Sometimes updates can require a world reset too in extreme cases. This diligence should apply to each version between what you have and what the latest recommended version is.