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I'm not an expert by far but the initial thing that jumps out at me is that you need to be running a later version of Forge.
Try updating your Forge 1.12.2 version to 14.23.5.2838 or later and see if that helps.
Personally I've been hoping things would return to just been a modpack launcher, I only ever used Twitch to download/create/edit packs but always objected to Minecraft been refered to as a 'Mod'.
Thanks team FTB and I look forward to getting my hands on the new App when it's ready :)
