Add a "harvest" line to the monster generating an error. It could be fixed with this:
Nechronica monster example
{
"id": "mon_nec_ZQ_sama",
"type": "MONSTER",
"name": "Zombie Queen",
"description": "It looks like a beautiful girl, but is actually the queen of the undead who leads countless undead.",
"species": "ZOMBIE",
"default_faction":"zombie",
"symbol":"Q",
"harvest": "zombie",
"color":"dkgray",
"size": "MEDIUM",
"diff": 40,
"hp": 300,
"speed": 90,
"material": [ "flesh" ],
"aggression": 5,
"morale": 100,
"melee_skill": 6,
"melee_dice": 4,
"melee_dice_sides": 6,
"melee_cut": 0,
"armor_bash": 12,
"armor_cut": 12,
"armor_stab": 12,
"armor_acid": 4,
"dodge": 2,
"vision_night": 6,
"path_settings": { "max_dist": 10 },
"special_attacks": [
[ "RESURRECT", 5 ],
[ "UPGRADE", 5 ],
[ "TENTACLE", 3 ],
[ "PARROT", 3 ]
],
"anger_triggers": [ "HURT", "PLAYER_CLOSE", "PLAYER_WEAK" ],
"death_drops": {
"subtype": "collection",
"groups": [
[ "default_ZQ_death_drops", 100 ],
[ "default_ZQrare_death_drops", 100 ]
]
},
"death_function": [ "NORMAL" ],
"burn_into": "mon_zombie_scorched",
"flags": [ "SEES", "HEARS", "SMELLS", "STUMBLES", "WARM", "BASHES", "POISON", "NO_BREATHE", "REVIVES", "BONES", "PATH_AVOID_DANGER_2", "PRIORITIZE_TARGETS" ,"REGENERATES_10"]
},
Below the "symbol": Q, I inserted the "harvest": "zombie",.
Now do the same thing in every monster lacking the "harvest" lines 