Traceback (most recent call last):


 "C:\Security\programs\cloudfail\socks.py", line 747, in connect

negotiate(self, dest_addr, dest_port)


 "C:\Security\programs\cloudfail\socks.py", line 419, in _negotiate_SOCKS5

CONNECT, dest_addr)


 "C:\Security\programs\cloudfail\socks.py", line 494, in _SOCKS5_request

raise SOCKS5Error("{0:#04x}: {1}".format(status, error))
socks.SOCKS5Error: 0x01: General SOCKS server failure

> Traceback (most recent call last):

>

 "/Users/heyuqi/opt/anaconda3/envs/vaex4/lib/python3.8/site-packages/IPython/core/interactiveshell.py", line 3418, in run_code exec(code_obj, self.user_global_ns, self.user_ns)
> 
 "<ipython-input-73-99e48b9ff077>", line 1, in <module>
>
df.sort(df.Class)
> 
 "/Users/heyuqi/development/vaex/install/vaex/packages/vaex-core/vaex/dataframe.py", line 4123, in sort indices = np.argsort(values, kind=kind)
> 
 "<__array_function__ internals>", line 5, in argsort
> 
 "/Users/heyuqi/opt/anaconda3/envs/vaex4/lib/python3.8/site-packages/numpy/core/fromnumeric.py", line 1107, in argsort return _wrapfunc(a, 'argsort', axis=axis, kind=kind, order=order)
> 
 "/Users/heyuqi/opt/anaconda3/envs/vaex4/lib/python3.8/site-packages/numpy/core/fromnumeric.py", line 55, in _wrapfunc return _wrapit(obj, method, *args, **kwds)
> 
 "/Users/heyuqi/opt/anaconda3/envs/vaex4/lib/python3.8/site-packages/numpy/core/fromnumeric.py", line 44, in _wrapit result = getattr(asarray(obj), method)(*args, **kwds)
> TypeError: '<' not supported between instances of 'str' and 'NoneType'

**Software information**
 - Vaex version (`import vaex; vaex.__version__)`:
 - {'vaex': '4.0.0a13',
 'vaex-core': '4.0.0a19',
 'vaex-viz': '0.5.0.dev1',
 'vaex-hdf5': '0.7.0a6',
 'vaex-server': '0.4.0a3',
 'vaex-astro': '0.8.0a1',
 'vaex-ui': '0.3.0',
 'vaex-jupyter': '0.6.0.dev1',
 'vaex-ml': '0.11.0a5',
 'vaex-graphql': '0.2.0.dev1'}
 - Vaex was installed via:
from source 
 - OS: MacOS Big Sur

