Traceback (most recent call last):

 "/uni-mainz.de/homes/mdeberts/anaconda3/envs/jupyter/lib/python3.8/site-packages/spyder_notebook/widgets/notebooktabwidget.py", line 214, in close_client
client.shutdown_kernel()

 "/uni-mainz.de/homes/mdeberts/anaconda3/envs/jupyter/lib/python3.8/site-packages/spyder_notebook/widgets/client.py", line 312, in shutdown_kernel
kernel_id = self.get_kernel_id()

 "/uni-mainz.de/homes/mdeberts/anaconda3/envs/jupyter/lib/python3.8/site-packages/spyder_notebook/widgets/client.py", line 281, in get_kernel_id
sessions_url = self.get_session_url()

 "/uni-mainz.de/homes/mdeberts/anaconda3/envs/jupyter/lib/python3.8/site-packages/spyder_notebook/widgets/client.py", line 272, in get_session_url
return self.add_token(url_path_join(self.server_url, 'api/sessions'))

 "/uni-mainz.de/homes/mdeberts/anaconda3/envs/jupyter/lib/python3.8/site-packages/notebook/utils.py", line 50, in url_path_join
initial = pieces[0].startswith('/')AttributeError: 'NoneType' object has no attribute 'startswith'
Traceback (most recent call last):


 "test.py", line 30, in <module>

cookies = c.getinfo(pycurl.INFO_COOKIELIST)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb3 in position 26: invalid start byte
