Hi folks!
Looked for this problem on Reddit and read all 50 Steam pages.
Multiple player have this problem but no solution:

In the pre-tribal phase (animal) you can't build a research Table, but have to use the "Perform tribal gartering"-ritual at the fireplace, at a table, ... which whil spark some random research-points.

The problem is: that when I click on the "perform tribal gathering"-button, zhe game pauses and a big popup window shows up, which is empty.
it's an ingame-window (thin outline, blueish-black tint).
There is nothing to click / choose / select / whatever

[Esc] cancels the window and resumes the game as usual (no freeze or anything else.

I've removes every other mod, beside the neccessary (in this order, and up to date):
> Harmony
> Core
> Vanilla Expanded Framework
> Vanilla Factions Expended - Tribals

still happens, and this is the only red error in the Debug-Log:

Failed to find RimWorld.PreceptDef named TreeConnection. There are 17 defs of this type loaded.


Has someone fould a solution / workaround? Thanks ahead!

I don't know since i am new to the game and haven't used any mods and didn't try the tribal stage, but did you try to set the researcher to top priority?
For some reason i got a message when playing vanilla with all dlcs at a research table that this is a long process or something and the researcher didn't do it until i set her priority to 1, but this was the colonist crashlanded where i got 3 colonist and that is further in the research tree.
Also properly lighted the area added a chair to research table.
Have you tried without mods and got the same problem?