Traceback (most recent call last):


 "eventHandler.pyo", line 152, in executeEvent


 "eventHandler.pyo", line 92, in __init__


 "eventHandler.pyo", line 100, in next


 "browseMode.pyo", line 1173, in event_caret


 "eventHandler.pyo", line 100, in next


 "NVDAObjects\behaviors.pyo", line 173, in event_caret


 "NVDAObjects\IAccessible\__init__.pyo", line 1368, in event_caret


 "NVDAObjects\__init__.pyo", line 1002, in event_caret


 "review.pyo", line 174, in handleCaretMove


 "documentBase.pyo", line 24, in makeTextInfo


 "NVDAObjects\IAccessible\ia2TextMozilla.pyo", line 93, in __init__


 "NVDAObjects\IAccessible\ia2TextMozilla.pyo", line 201, in _findContentDescendant
COMError: (-2147467259, 'Unspecified error', (None, None, None, 0, None))

Traceback (most recent call last):

 "/opt/conda/bin/jupyterhub-singleuser", line 3, in <module>
from jupyterhub.singleuser import main

 "/opt/conda/lib/python3.5/site-packages/jupyterhub/singleuser.py", line 17, in <module>
raise ImportError("JupyterHub single-user server requires notebook >= 4.0")ImportError: JupyterHub single-user server requires notebook >= 4.0