When I try to launch Revelation from the MYM launcher the console comes up with this: and immediately goes back to the pack selection screen. There is no crash-report. I have tried reinstalling and hard force updating the pack several times, and I have 4GB of RAM allocated to the launcher. It works fine on the Twitch/Curse launcher, so I can just use that, but I would like to have the MYM launcher working. Also sometimes when I click the launcher button and login it says something about invalid email/password even though I have the right info, it works if I try again. I am unsure if these issues are related but figured I would mention it.
Please right click the modpack and click view folder then go back to the .mineyourmind directory and delete the net/minecraft directory inside libraries. Delete instances/FTB-Revelation and try again.
Alright, I will update here once I have tried that, it may be a little while. [doublepost=1523318738,1523278962][/doublepost]That worked. Thanks SirWill!