BROKEN MOD, Chrashes on load.
Do not download

Could you be slightly more specific with an actual error to start?
Yes I renamed the thread from its childish title.

"""
The mod Biter Reincarnation caused a non-recoverable error.
Please report this error to the mod author.

Error while running event biter_reincarnation::on_init()
biter_reincarnation/scripts/trees.lua:30: attempt to index field 'autoplace_specification' (a nil value)
stack traceback:
biter_reincarnation/scripts/trees.lua:30: in function 'PopulateTreeData'
biter_reincarnation/control.lua:70: in function <biter_reincarnation/control.lua:67>
"""

0.17.50 game version

What landscape or decorative mods do you have running?

i found out what coses the mod to crash: fws_0.2.2 Fish and Wildlife

30.676 Checksum for script biter_reincarnation/control.lua: 1507376899
30.679 Checksum for script fws/control.lua: 2909385833
30.724 Error AppManager.cpp:613: The mod Biter Reincarnation caused a non-recoverable error.
Please report this error to the mod author.

Error while running event biter_reincarnation::on_init()
biter_reincarnation/scripts/trees.lua:30: attempt to index field 'autoplace_specification' (a nil value)
stack traceback:
biter_reincarnation/scripts/trees.lua:30: in function 'PopulateTreeData'
biter_reincarnation/control.lua:70: in function <biter_reincarnation/control.lua:67>

Ah I see, I had assumed people would only add trees that are placed by map gen, or would be mods too big for me to handle. But in this case its neither, I just need to ignore the added trees. Will update.
thanks

The update means it doesn't error on playing and looks to be generating the natural trees for the environments.

Assumptions about other mod behavior / data setup will getcha every time.

muppet can u explain me how your code intefiers with other mods.... as far i understand the popultae tree data kinda but whats about the trees added by your code... what makes them so unstable

Biter Reincarnation doesn't add trees, but it looks at them. If they don't look as expected (such as the intermediate growing trees from my mod), it had a problem.

Exactly how Schmendrick put it.
I coded it knowing I wouldn't support mods like Alien Biomes, but I hadn't considered non map generated tree types.

so it was helpfull from me to notice the error from startup and posting it ? :D