So, I'm playing with Europe 1100 mod, I tried to start an abdication faction , I got all the support, and when I press start rebellion I get an error report.

But when I press on attempt to continue, it actually continues the gameplay, and the rebellion is done, but i'm not at war with the kingdom i tried to rebel on, I'm just a rebel faction with no enemies or allies or anything. I can answer any questions to help fix it.

Here's the report, and thanks in advance.
https://report.butr.link/FD2292.html