Some random javascript error that it cannot read property map. Have restarted it a few times. Worked a few days ago, doesn't work today... Cannot get past this.
Same Error shows up in MCL-18505. That one was marked as a duplicate of one that needed a JRE. I have JRE's installed, so I don't think that's the problem.
```
[09:14:27] [ForkJoinPool-1-worker-51/INFO] [net.creeperhost.creeperlauncher.pack.LocalInstance]: Starting launcher at /home/dkowis/.ftba/bin
[09:14:27] [ForkJoinPool-1-worker-51/ERROR] [net.creeperhost.creeperlauncher.pack.LocalInstance]: Unable to initialize MineTogether Connect!
[09:14:27] [ForkJoinPool.commonPool-worker-23/INFO] [Minecraft Launcher 0]: https://launchermeta.mojang.com/v1/products/launcher/6f083b80d5e6fabbc4236f81d0d8f8a350c665a9/linux.json
[09:14:27] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091427.953810:INFO:main_context.cpp(136)] CEF initialized successfully.
[09:14:27] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091427.953884:INFO:main_context.cpp(138)] CEF version: 86.0.23+ga2c2edf+chromium-86.0.4240.193
[09:14:28] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: Created browser window for reuse: 0xbe00001
[09:14:31] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091431.673925:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:14:31] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091431.676518:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:14:37] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091437.250214:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:14:37] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091437.251572:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:14:37] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091437.848074:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:14:37] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091437.849300:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:14:38] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091438.290434:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:14:38] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091438.292048:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:16:23] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091623.724551:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:16:23] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091623.725814:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:16:24] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091624.566937:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:16:24] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091624.568795:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
[09:16:25] [ForkJoinPool.commonPool-worker-9/ERROR] [Minecraft Launcher 0]: [1127/091625.135476:INFO:CONSOLE(2)] "TypeError: Cannot read property 'map' of undefined", source: mojang://launcher/static/js/app.d337b453.bundle.js (2)
```
*Okay, for anyone else that finds this.*
The FTB launcher and Microsoft's launcher do not get along. If this happens, launch the minecraft launcher from `~/.minecraft/launcher/minecraft-launcher` standalone. It runs some update that, for some reason only known to cause player frustration, that never used to happen, doesn't work when it is launched from the FTBApp.
Then, exit that launcher, and go back to the one that FTBA launches. Then sacrifice several chickens to the Microsoft Wealth Gods, and maybe it'll work. It did for me.