Hello! When starting the game with your mod - it shows an error:

0.853 Loading mod Diversitree 1.0.3 (data.lua)
0.855 Error ModManager.cpp:1741: Failed to load mod "Diversitree": Diversitree/data.lua:12: attempt to index field 'tree-seed' (a nil value)
stack traceback:
Diversitree/data.lua:12: in main chunk

It seems like you're using a mod that deletes the tree-seed prototype, which this mod needs in order to be able to do anything.

I specifically disabled all mods except yours.

This error still pops up.

So either the game is buggy, or the problem is in your mod.

I wasn't able to reproduce this issue.

I started Factorio 2.0.24 with only space-age, quality, elevated-rails, and Diversitree enabled. The game loaded fine and I was able to start a new map, enter cheat mode, give myself some tree seeds, and plant them.

(If you truly disabled all mods except this one, you'd get this issue because space-age isn't loading, and it requires space-age, but Factorio should stop you from doing that!)

I reinstalled the game. Checked it via "editor". The game has "tree-seed".

I play with Space Age.

I guess I was just unlucky...

What's interesting is that 1.0.2 version of your mod launched without problems. Strange...