Errors when trying to use an example

[alex4200]

I am trying to use the block_analysis.py for a Minecraft world 1.14.3. I have tried two commands

python block_analysis.py <path_to_world>

and get error

Parsing region r.-9.-13.mca...
Traceback (most recent call last):
  File "block_analysis.py", line 149, in <module>
    sys.exit(main(world_folder, start, stop))
  File "block_analysis.py", line 120, in main
    process_region_file(region, start, stop)
  File "block_analysis.py", line 78, in process_region_file
    for c in region.iter_chunks_class():
  File "/Users/mc/Code/NBT/nbt/region.py", line 494, in iter_chunks_class
    yield self.chunkclass(self.get_chunk(m.x, m.z))
  File "/Users/mc/Code/NBT/nbt/chunk.py", line 255, in __init__
    raise NotImplemented
TypeError: exceptions must derive from BaseException

and also

python block_analysis.py <path_to_world>/region

with error

Traceback (most recent call last):
File "block_analysis.py", line 149, in
sys.exit(main(world_folder, start, stop))
File "block_analysis.py", line 116, in main
world = WorldFolder(world_folder)
File "/Users/mc/Code/NBT/nbt/world.py", line 259, in call
raise UnknownWorldFormat("Empty world or unknown format")
nbt.world.UnknownWorldFormat: Empty world or unknown format

I am doing something wrong? How can I fix this error?

[AdamBlance]

This is because you're trying to use it with a 1.14.3 world. Looks like AnvilChunk only supports 1.13.2 worlds at the moment.