Started a new map and got an error related to the mod Rampant. This thread suggests that NE enemies is the cause of the error with Rampant:

https://mods.factorio.com/mod/Rampant/discussion/5b4f9aa98bb15d000b427fd8

Might be worth looking into if compatibility is important.

Thanks for letting me know.
I've added a quick fix in 9.0.1

Currently the new spawners won't spawn with Rampant. He needs to add compatibility for it to work..

Thanks TheSAguy.
Great mods! Thanks for all your hard work!

If you delete the lines 41 through 44 of data-final-fixes.lua in the RAMPANT mod, it will be compatible :)

for _, unitSpawner in pairs(data.raw["unit-spawner"]) do
if (unitSpawner.name ~= "biter-spawner") then
    unitSpawner.autoplace = nil 
end

I would not recommend that, as it will cause other issues in the mod around the new enemies with region/base management.

A new version of Rampant should be available now.

Thanks!