After fixing my last error, I am now getting this one.

I have not jet added any fire; rain etc. and am currently not using UGX-mod.
I already marked almost all fx-assets as inactive but this doesn't solve anything either.

If your using sniperbolts scripts & don't have a nazi_zombie_ prefix then your map is most likely being loaded as a singleplayer level, not a zombies.

I'm not using any scripts (atm.) except two doors if they count.

I'm not using any scripts (atm.) except two doors if they count.

Your map has to be using sometype of scripts to function properly.

You said that you made some fx-assets "inactive" what did you mean by that?

I made some doubleslashes (//) in zone_source/dlc3 do deactivate them. (in mods/nazi_zombie_myfolder ofc.)
The error has already been there before I did that.

I made some doubleslashes (//) in zone_source/dlc3 do deactivate them. (in mods/nazi_zombie_myfolder ofc.)
The error has already been there before I did that.

Though i've never tried it, i don't think you can modify your zone_srouce via a Mod. Also if you need to remove more FX you can delete the ones in your map specifc .csv in zone_source.

That's exactly what I did.

EDIT:
Now I know that it's not the map but my modtools. Did anyone manage to fix such an error without a reinstall? Maybe I should just reinstall all that one more time..

nope i have the same problem as you, did you manage to fix this problem? if you did can you please tell me what you did thanks

I did solve that. Daedra didn't directly write the solution above but gave me the final hint.

After installing the modtools you have to either get the raw files of sniperbolts test2 or oldtown. Your scriptplacer will use the scripts from one of these maps to create your mod. I'm not sure where to download them though.. I got them from a friend. But they should be somewhere on ZM or in the description on one of ZKs tutorials.