Cataclysm:DDA - Removes Nether Creatures

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11:16:20.770 : Starting log.
11:16:20.771 INFO : Cataclysm DDA version 0.D-3772-g140838e
11:16:20.829 WARNING : opendir [./sound/] failed with "No such file or directory".
11:16:20.861 INFO : Number of render drivers on your system: 4
11:16:20.861 INFO : Render driver: 0/direct3d
11:16:20.861 INFO : Render driver: 1/direct3d11
11:16:20.861 INFO : Render driver: 2/opengl
11:16:20.861 INFO : Render driver: 3/software
11:16:20.868 INFO : Language is set to: 'en'
11:16:21.788 INFO : SDL version used during compile is 2.0.5
11:16:21.788 INFO : SDL version used during linking and in runtime is 2.0.5
11:16:21.938 INFO : Active renderer: 1/direct3d11
11:16:22.568 INFO : USE_COLOR_MODULATED_TEXTURES is set to 0
11:16:23.062 WARNING : opendir [./mods/] failed with "No such file or directory".
11:17:47.026 WARNING : opendir [data/mods//Removes Nether Creatures/modinfo.json] failed with "Not a directory".
11:17:47.033 WARNING : opendir [./save/testpig/mods] failed with "No such file or directory".
11:17:55.976 INFO : Loaded tileset: MSX++DEAD_PEOPLE
11:17:56.414 ERROR : (error message will follow backtrace)
	(@0x59759e[cataclysm-tiles.exe+0x19759e]),
	(@0x597bca[cataclysm-tiles.exe+0x197bca]),
	(@0x59af86[cataclysm-tiles.exe+0x19af86]),
	(@0x7b8ae1[cataclysm-tiles.exe+0x3b8ae1]),
	(@0x712ef6[cataclysm-tiles.exe+0x312ef6]),
	(@0x713f33[cataclysm-tiles.exe+0x313f33]),
	(@0x683186[cataclysm-tiles.exe+0x283186]),
	(@0x6a7c85[cataclysm-tiles.exe+0x2a7c85]),
	(@0x87fa97[cataclysm-tiles.exe+0x47fa97]),
	(@0x8832a0[cataclysm-tiles.exe+0x4832a0]),
	(IMG_LoadWEBP_RW+0x532def@0x14ce55f[cataclysm-tiles.exe+0x10ce55f]),
	(@0x4013ed[cataclysm-tiles.exe+0x13ed]),
	(@0x4014fb[cataclysm-tiles.exe+0x14fb]),
	(BaseThreadInitThunk+0x14@0x7ffd51d37974[KERNEL32.DLL+0x17974]),
	(RtlUserThreadStart+0x21@0x7ffd5496a271[ntdll.dll+0x6a271]),
Backtrace emission took 0 seconds.
src/item_factory.cpp:1121 [void Item_factory::check_definitions() const] warnings for type vortex_stone:
invalid revert_to property null

11:18:44.812 ERROR : src/overmap.cpp:986 [void overmap_special::check() const] In overmap special "Slime Pit", point [0,0,0], location "never" is invalid.