Return of Reckoning

When i use the launcher of the RoR launcher i have this

https://imgshare.io/image/sans-titre.PEOnt

Reboot, RoRUpdater, admin, dont do anything

I'm having that problem as well. Even a full, fresh install did nothing.

This meseeage means a config file in the directory app data is broken

Go to the directory mentioned in the error log and rename is to something else (delete if you are brave)
Restart the launcher and it will recreate the directory and content
That is the app data/returnofreckoning directory
Change it to something like
App data/returnofreckoningo-old