So, for some reason whenever I click launch in the ftb launcher it just does a few things in the console, doesn't even open up minecraft, then just goes back to the launcher. I don't know why. No modpacks will work in ftb. I tried skyfactory 3 and ftb infinity evolved. Other modpack launchers won't even work. I think it might be a problem with java as no modpacks work. I tried reinstalling java with no luck. I have also gave it 12 gigs of ram so its good on that. This was working a few days ago and its not now and I don't know why. I tried using the curse launcher but that had never worked for me before. The ftb launcher normally worked but now no modpacks even work even modpacks that are not in the ftb launcher. Just running mods with forge do work though. There is this weird error at the beginning.
From Console: Feb 06, 2017 5:02:08 PM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
I don't know if thats a problem but I just wanted to show that. I had even tried enabling everything that said java on my firewall but still no luck. I'm not sure if its an account issue but I really think its not. Its just every once in a while it says invalid credentials after I try to launch it a few times every once in a while. I just don't know why ftb and technic don't work. Here is the launcher log.