Traceback (most recent call last):

 "/opt/minecraft/map_maker/chunk.py", line 160, in render_and_save
return a.render_and_save(cave)

 "/opt/minecraft/map_maker/chunk.py", line 483, in render_and_save
img = self.chunk_render(cave=cave)

 "/opt/minecraft/map_maker/chunk.py", line 607, in chunk_render
right_blocks = self.right_blocks

 "/opt/minecraft/map_maker/chunk.py", line 310, in _load_right_blocks
self._load_right()

 "/opt/minecraft/map_maker/chunk.py", line 298, in _load_right
chunk_data = get_lvldata(chunk_path)

 "/opt/minecraft/map_maker/chunk.py", line 51, in get_lvldata
return nbt.load(filename)[1]['Level']

 "/opt/minecraft/map_maker/nbt.py", line 23, in load
return NBT
Reader(fileobj).read_all()

 "/opt/minecraft/map_maker/nbt.py", line 135, in read_all
tagtype = ord(self._file.read(1))TypeError: ord() expected a character, but string of length 0 found
ERROR: Signature extraction failed: Traceback (most recent call last):

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 479, in _decrypt_signature
video_id, player_url, s

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 383, in _extract_signature_function
res = self._parse_sig_js(code)

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 454, in _parse_sig_js
u'Initial JS player signature function name')

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 391, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type
youtube-dl -U
to update.