Traceback (most recent call last):


 "/usr/local/Cellar/ranger/1.9.2/libexec/ranger/core/main.py", line 195, in main

fm.loop()


 "/usr/local/Cellar/ranger/1.9.2/libexec/ranger/core/fm.py", line 394, in loop

ui.redraw()


 "/usr/local/Cellar/ranger/1.9.2/libexec/ranger/gui/ui.py", line 339, in redraw

self.finalize()


 "/usr/local/Cellar/ranger/1.9.2/libexec/ranger/gui/ui.py", line 394, in finalize

DisplayableContainer.finalize(self)


 "/usr/local/Cellar/ranger/1.9.2/libexec/ranger/gui/displayable.py", line 264, in finalize

displayable.finalize()


 "/usr/local/Cellar/ranger/1.9.2/libexec/ranger/gui/widgets/view_base.py", line 60, in finalize

- self.main_column.scroll_begin
AttributeError: 'NoneType' object has no attribute 'pointer'


Traceback (most recent call last):

 "/opt/anaconda3/lib/python3.4/site-packages/tornado/web.py", line 1334, in _execute
result = yield result

 "/opt/anaconda3/lib/python3.4/site-packages/jupyterhub/handlers/base.py", line 371, in get
yield self.spawn_single_user(current_user)

 "/opt/anaconda3/lib/python3.4/site-packages/jupyterhub/handlers/base.py", line 214, in spawn_single_user
yield gen.with_timeout(timedelta(seconds=self.slow_spawn_timeout), f)

 "/opt/anaconda3/lib/python3.4/site-packages/jupyterhub/orm.py", line 383, in spawn
user=self.name, url=self.server.url, error=e,
AttributeError: 'NoneType' object has no attribute 'url'