Sorry Arramus but think I found another issue
ArgumentException: Type cannot be null.
at (wrapper managed-to-native) UnityEngine.GameObject.GetComponent(UnityEngine.GameObject,System.Type)
at EModelBase.createAvatarController (EntityClass _ec) [0x000e0] in <b9bc0d5ab478449782320d065c54704e>:0
at EModelBase.Init (World _world, Entity _entity) [0x000ac] in <b9bc0d5ab478449782320d065c54704e>:0
at Entity.InitEModel () [0x00061] in <b9bc0d5ab478449782320d065c54704e>:0
at Entity.Init (System.Int32 _entityClass) [0x0000d] in <b9bc0d5ab478449782320d065c54704e>:0
at EntityAlive.Init (System.Int32 _entityClass) [0x00000] in <b9bc0d5ab478449782320d065c54704e>:0
at EntityEnemy.Init (System.Int32 _entityClass) [0x00000] in <b9bc0d5ab478449782320d065c54704e>:0
at EntityFactory.CreateEntity (EntityCreationData _ecd) [0x004c2] in <b9bc0d5ab478449782320d065c54704e>:0
at EntityFactory.CreateEntity (System.Int32 _et, System.Int32 _id, ItemValue _itemValue, System.Int32 _count, UnityEngine.Vector3 _transformPos, UnityEngine.Vector3 _transformRot, System.Single _lifetime, System.Int32 _playerId, System.String _skinName, System.Int32 _spawnById, System.String _spawnByName) [0x0001b] in <b9bc0d5ab478449782320d065c54704e>:0
at EntityFactory.CreateEntity (System.Int32 _et, System.Int32 _id, UnityEngine.Vector3 _transformPos, UnityEngine.Vector3 _rotation) [0x0000c] in <b9bc0d5ab478449782320d065c54704e>:0
at EntityFactory.CreateEntity (System.Int32 _et, UnityEngine.Vector3 _transformPos) [0x00014] in <b9bc0d5ab478449782320d065c54704e>:0
at SpawnManagerBiomes.SpawnUpdate (System.String _spawnerName, System.Boolean _isSpawnEnemy, ChunkAreaBiomeSpawnData _chunkBiomeSpawnData) [0x0043f] in <b9bc0d5ab478449782320d065c54704e>:0
at SpawnManagerBiomes.Update (System.String _spawnerName, System.Boolean _bSpawnEnemyEntities, System.Object _userData) [0x00007] in <b9bc0d5ab478449782320d065c54704e>:0
at World.OnUpdateTick (System.Single _partialTicks, System.ArraySegment`1[T] _activeChunks) [0x001e6] in <b9bc0d5ab478449782320d065c54704e>:0
at GameManager.UpdateTick () [0x00073] in <b9bc0d5ab478449782320d065c54704e>:0
at GameManager.gmUpdate () [0x00336] in <b9bc0d5ab478449782320d065c54704e>:0
at GameManager.Update () [0x00000] in <b9bc0d5ab478449782320d065c54704e>:0
That Avatar Controller thing in your entityclasses file is causing another error. The mod is still playable but wanted to make you aware of it.
Thanks