Open FTB Revelation launch error due to something scala something ...

[ThunderMine]

The launcher kills itself more or less right away after pressing start in the Twitch app.
I'll include both the game-loading logs and the crashlogs.

(PS: It says something about BD. Lib in the launcher progress thing just before it crashes.)

Game-loading log:
03:40:06
launcher
main
info
Preparing to launch minecraft client for forge-14.23.5.2836
03:40:06
launcher
main
warn
Couldn't fetch SHA1 checksum for https://modloaders.forgecdn.net/647....2-14.23.5.2836/forge-1.12.2-14.23.5.2836.jar
03:40:06
launcher
main
warn
Have local file C:\Users\torde\Twitch\Minecraft\Install\libraries\net\minecraftforge\forge\1.12.2-14.23.5.2836\forge-1.12.2-14.23.5.2836.jar but don't know what size or hash it should be. Have to assume it's good.
03:40:06
launcher
main
warn
Couldn't fetch SHA1 checksum for https://s3.amazonaws.com/Minecraft.Download/versions/1.12.2/1.12.2.jar
03:40:06
launcher
main
warn
Have local file C:\Users\torde\Twitch\Minecraft\Install\versions\1.12.2\1.12.2.jar but don't know what size or hash it should be. Have to assume it's good.
03:40:06
launcher
main
warn
Couldn't fetch SHA1 checksum for https://modloaders.forgecdn.net/647622546/maven/org/ow2/asm/asm-all/5.2/asm-all-5.2.jar
03:40:06
launcher
main
warn
Have local file C:\Users\torde\Twitch\Minecraft\Install\libraries\org\ow2\asm\asm-all\5.2\asm-all-5.2.jar but don't know what size or hash it should be. Have to assume it's good.
03:40:07
launcher
main
warn
Couldn't fetch SHA1 checksum for https://modloaders.forgecdn.net/647622546/maven/org/jline/jline/3.5.1/jline-3.5.1.jar
03:40:07
launcher
main
warn
Have local file C:\Users\torde\Twitch\Minecraft\Install\libraries\org\jline\jline\3.5.1\jline-3.5.1.jar but don't know what size or hash it should be. Have to assume it's good.
03:40:07
launcher
main
warn
Couldn't fetch SHA1 checksum for https://modloaders.forgecdn.net/647...ka-actor_2.11/2.3.3/akka-actor_2.11-2.3.3.jar
03:40:07
launcher
main
warn
Have local file C:\Users\torde\Twitch\Minecraft\Install\libraries\com\typesafe\akka\akka-actor_2.11\2.3.3\akka-actor_2.11-2.3.3.jar but don't know what size or hash it should be. Have to assume it's good.


Due to the message being too long, I included the crashlogs as separate files.

 

[GrosseBouffe_]

I just got the same problem on a second computer that I use, No problem on the first one but on this one, the game start initializing some mods and then crash.

It says :
The game crashed whilst initializing game
Error: java.lang.NoClassDefFoundError: scala/collection/Seq

 

[GrosseBouffe_]

I actually do not know how to remove the foamfix something