was running 1.3 fine,( OSX 11.6.3, Python 3.9) now on 1.5 and it won’t even launch . Tried it in a new virtualenv and still not working. Tried it without virtual env and still the error.
‘streamlit hello’ just gives:
streamlit hello
Traceback (most recent call last):
  File "/usr/local/bin/streamlit", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/streamlit/cli.py", line 154, in main_hello
    bootstrap.load_config_options(flag_options=kwargs)
  File "/usr/local/lib/python3.9/site-packages/streamlit/bootstrap.py", line 318, in load_config_options
    config.get_config_options(force_reparse=True, options_from_flags=options_from_flags)
  File "/usr/local/lib/python3.9/site-packages/streamlit/config.py", line 1006, in get_config_options
    _update_config_with_toml(file_contents, filename)
  File "/usr/local/lib/python3.9/site-packages/streamlit/config.py", line 888, in _update_config_with_toml
    _set_option(f"{section}.{name}", value, where_defined)
  File "/usr/local/lib/python3.9/site-packages/streamlit/config.py", line 865, in _set_option
    assert key in _config_options, f'Key "{key}" is not defined.'
AssertionError: Key "s3.keyPrefix" is not defined.