The mod RPG System (1.3.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event RPGsystem::on_rocket_launched (ID 10)
RPGsystem/control.lua:1524: attempt to index field 'rocketsXP_count' (a nil value)
stack traceback:
RPGsystem/control.lua:1524: in function <RPGsystem/control.lua:1517>

Getting the same thing. Crash to menu upon first rocket launch. Had a Satellite Payload and using tons of mods.

Same here. My best guess would be a conflict with Space exploration. Because it appeared after i installed that modpack.

Getting the same error on first satellite rocket launch

Good to know the crash also happens with satellite payload, as I had a fish payload since I was attempting to do modded 100% runs, which means it makes the most sense to get a fish sent to space at least once.

I hope its fixed. Please update

Can confirm with new version 1.3.1 that it's fixed for me. Just sent a Satellite into orbit.