Another error

ModError: Failed to load and run script from C:\Users\Samson.COZEN2\Desktop\Portable video games\minetest-5.5.0-win64\minetest-5.5.0-win64\bin\..\mods\moretrees\init.lua:
...win64\minetest-5.5.0-win64\bin\..\mods\biome_lib/api.lua:36: attempt to concatenate local 'msg' (a table value)
stack traceback:
	...win64\minetest-5.5.0-win64\bin\..\mods\biome_lib/api.lua:36: in function 'dbg'
	...\minetest-5.5.0-win64\bin\..\mods\moretrees/saplings.lua:10: in main chunk
	[C]: in function 'dofile'
	...in64\minetest-5.5.0-win64\bin\..\mods\moretrees\init.lua:79: in main chunk
Check debug.txt for details.