Traceback (most recent call last):

 "/opt/anaconda3/lib/python3.8/site-packages/qtconsole/comms.py", line 177, in comm_msg
comm.handle_msg(msg)

 "/opt/anaconda3/lib/python3.8/site-packages/qtconsole/comms.py", line 265, in handle_msg
return self._msg_callback(msg)

 "/opt/anaconda3/lib/python3.8/site-packages/spyder_kernels/comms/commbase.py", line 330, in _comm_message
self._message_handlers[spyder_msg_type](TypeError: _handle_remote_call_reply() missing 1 required positional argument: 'load_exception'
Traceback (most recent call last):

 ".../pandas-0.18.1/pandas/tests/test_graphics_others.py", line 408, in test_scatter_plot_legacy
_check_plot_works(scat, diagonal='kde')

 ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3982, in _check_plot_works
ret = f(**kwargs)

 ".../pandas-0.18.1/pandas/tests/test_graphics_others.py", line 402, in scat
return plotting.scatter_matrix(df, **kwds)

 ".../pandas-0.18.1/pandas/tools/plotting.py", line 370, in scatter_matrix
gkde = gaussian_kde(y)

 "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
self.set_bandwidth(bw_method=bw_method)

 "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
self._compute_covariance()

 "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n

 "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
a_det, info = fdet(a1, overwrite_a=overwrite_a)TypeError: 'NoneType' object is not callable