I'm trying to make a berry creature but I get an error: SLUDGLING:DEFAULT:body: No tissue thickness
creature_mm
[OBJECT:CREATURE]
[CREATURE:SLUDGLING]
[NAME:sludgling:sludlings:sludgling]
[CASTE_NAME:sludgling:sludlings:sludgling]
[DESCRIPTION:A gelatonious creature, seems to have plantlike properties.]
[CREATURE_TILE:'Õ'][COLOR:0:4:0]
[BIOME:ANY_TEMPERATE]
[POPULATION_NUMBER:40:80]
[CLUSTER_NUMBER:10:15]
[FREQUENCY:50]
[BODY:BASIC_1PARTBODY]
[NO_THOUGHT_CENTER_FOR_MOVEMENT]
[TISSUE:SLUDGE_BERRY]
[TISSUE_NAME:sludge berry:sludge berries]
[FUNCTIONAL]
[STRUCTURAL]
[TISSUE_MATERIAL:PLANT_MAT:SLUDGE_BERRY:STRUCTURAL]
[RELATIVE_THICKNESS:3]
[HEALING_RATE:100]
[VASCULAR:10]
[TISSUE_SHAPE:LAYER]
[BLOOD:PLANT_MAT:SLUDGE_BERRY:DRINK]
[CREATURE_CLASS:PLANT]
[BODY_SIZE:0:0:50000]
[UBIQUITOUS]
[COMMON_DOMESTIC]
[PACK_ANIMAL]
[LARGE_ROAMING]
[NOBONES]
[NATURAL]
[ALL_ACTIVE]
[NOBREATHE]
[COOKABLE_LIVE]
[EXTRAVISION]
[LARGE_ROAMING]
[NO_DIZZINESS]
[NO_DRINK]
[NO_EAT]
[NO_FEVERS]
[NO_SLEEP]
[NOEMOTION]
[NOEXERT]
[NOFEAR]
[NOMEAT]
[NONAUSEA]
[NOPAIN]
[NOSKIN]
[NOSKULL]
[NOSTUN]
[PARALYZEIMMUNE]
[SWIMS_INNATE]
[WEBIMMUNE]
[MEANDERER]
[NOTHOUGHT]
[MAXAGE:500:1000]
plant_mm
[OBJECT:PLANT]
[PLANT:SLUDGE_BERRY]
[NAME:sludge berry]
[NAME_PLURAL:sludge berries]
[ADJ:sludge berry]
[USE_MATERIAL_TEMPLATE:STRUCTURAL:STRUCTURAL_PLANT_TEMPLATE]
[MATERIAL_VALUE:15]
[EDIBLE_VERMIN]
[EDIBLE_RAW]
[EDIBLE_COOKED]
[BUTCHER_SPECIAL:PLANT:NONE] <-- This is the important part!
[BASIC_MAT:LOCAL_PLANT_MAT:STRUCTURAL]
[PICKED_TILE:58]
[PICKED_COLOR:0:4:0]
[WET]
[VALUE:20]
[USE_MATERIAL_TEMPLATE:DRINK:PLANT_ALCOHOL_TEMPLATE]
[STATE_NAME_ADJ:ALL_SOLID:frozen sludge goo]
[STATE_NAME_ADJ:LIQUID:sludge goo]
[STATE_NAME_ADJ:GAS:boiling sludge goo]
[MATERIAL_VALUE:15]
[DISPLAY_COLOR:0:4:0]
[EDIBLE_RAW]
[EDIBLE_COOKED]
[PREFIX:NONE]
[DRINK:LOCAL_PLANT_MAT:DRINK]
Any idea what I did wrong?