higlass-manage start raises error ValueError: invalid literal for int() with base 16: b''

I just installed higlass, but if I try to start working with it by typing higlass-manage start, the following error is raised:

`Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/urllib3/response.py", line 697, in _update_chunk_length
self.chunk_left = int(line, 16)
ValueError: invalid literal for int() with base 16: b''

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/urllib3/response.py", line 438, in _error_catcher
yield
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/urllib3/response.py", line 764, in read_chunked
self._update_chunk_length()
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/urllib3/response.py", line 701, in _update_chunk_length
raise InvalidChunkLength(self, line)
urllib3.exceptions.InvalidChunkLength: InvalidChunkLength(got length b'', 0 bytes read)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/requests/models.py", line 753, in generate
for chunk in self.raw.stream(chunk_size, decode_content=True):
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/urllib3/response.py", line 572, in stream
for line in self.read_chunked(amt, decode_content=decode_content):
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/urllib3/response.py", line 793, in read_chunked
self._original_response.close()
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/contextlib.py", line 135, in __exit__
self.gen.throw(type, value, traceback)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/urllib3/response.py", line 455, in _error_catcher
raise ProtocolError("Connection broken: %r" % e, e)
urllib3.exceptions.ProtocolError: ("Connection broken: InvalidChunkLength(got length b'', 0 bytes read)", InvalidChunkLength(got length b'', 0 bytes read))`

I obtain similar problems by trying to ingest a bedfile.

Any help is very much appreciated!