I think one of my addons is conflicting with the procedural terrain mod, but i don't know which one. there are couches everywhere and terrain doesn't show up (water does, tho). The addon is constantly spouting errors, these in particular:

[Procedural Terrain / Maps (Beta)] lua/entities/terrain_chunk.lua:586: attempt to index field 'TreeMeshes_Low' (a nil value)
1. unknown - lua/entities/terrain_chunk.lua:586
2. DrawModel - [C]:-1
3. unknown - lua/entities/terrain_chunk.lua:601

[Procedural Terrain / Maps (Beta)] lua/entities/terrain_chunk.lua:586: attempt to index field 'TreeMeshes_Low' (a nil value)
1. unknown - lua/entities/terrain_chunk.lua:586
2. DrawModel - [C]:-1
3. unknown - lua/entities/terrain_chunk.lua:601
4. RenderView - [C]:-1
5. v - lua/autorun/client-level-transitions.lua:11
6. unknown - lua/includes/modules/hook.lua:96

[Procedural Terrain / Maps (Beta)] lua/entities/terrain_chunk.lua:586: attempt to index field 'TreeMeshes_Low' (a nil value)
1. unknown - lua/entities/terrain_chunk.lua:586
2. DrawModel - [C]:-1
3. unknown - lua/entities/terrain_chunk.lua:601
4. RenderView - [C]:-1
5. unknown - lua/autorun/terrain_menu.lua:459

[Procedural Terrain / Maps (Beta)] lua/entities/terrain_chunk.lua:120: attempt to get length of field 'TreeModels' (a nil value)
1. GenerateTrees - lua/entities/terrain_chunk.lua:120
2. DoClick - lua/autorun/terrain_menu.lua:521
3. unknown - lua/vgui/dlabel.lua:237

Is one of my addons conflicting with this one? If so, is there any way to narrow it down?