Jupyter Notebook 500 : Internal Server Error

Question

I want to learn how to use Jupyter Notebook. So far, I have managed to download and install it (using pip), but I'm having trouble opening it.

I am opening it by typing:

jupyter notebook 

in my terminal. It opens in my browser, with the URL:

http://localhost:8888/tree 

and I just get a big:

500 : Internal Server Error 

message. Could someone point me in the right direction of what's going wrong please?

The full error message in my terminal:

[E 17:53:52.034 NotebookApp] Uncaught exception GET /tree (::1)     HTTPServerRequest(protocol='http', host='localhost:8888', method='GET', uri='/tree', version='HTTP/1.1', remote_ip='::1', headers={'Accept-Language': 'en-US,en;q=0.8,es;q=0.6', 'Accept-Encoding': 'gzip, deflate, sdch', 'Host': 'localhost:8888', 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8', 'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36', 'Connection': 'keep-alive', 'Upgrade-Insecure-Requests': '1'})     Traceback (most recent call last):       File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tornado/web.py", line 1443, in _execute         result = method(*self.path_args, **self.path_kwargs)       File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tornado/web.py", line 2800, in wrapper         return method(self, *args, **kwargs)       File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/notebook/tree/handlers.py", line 50, in get         terminals_available=self.settings['terminals_available'],       File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/notebook/base/handlers.py", line 302, in render_template         template = self.get_template(name)       File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/notebook/base/handlers.py", line 298, in get_template         return self.settings['jinja2_env'].get_template(name)       File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Jinja2-2.6-py2.7.egg/jinja2/environment.py", line 719, in get_template         return self._load_template(name, self.make_globals(globals))       File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Jinja2-2.6-py2.7.egg/jinja2/environment.py", line 693, in _load_template         template = self.loader.load(self, name, globals)       File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Jinja2-2.6-py2.7.egg/jinja2/loaders.py", line 127, in load         code = environment.compile(source, name, filename)       File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Jinja2-2.6-py2.7.egg/jinja2/environment.py", line 493, in compile         self.handle_exception(exc_info, source_hint=source)       File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/notebook/templates/tree.html", line 8, in template         data-base-url="{{base_url | urlencode}}"     TemplateAssertionError: no filter named 'urlencode' [E 17:53:52.819 NotebookApp] {       "Accept-Language": "en-US,en;q=0.8,es;q=0.6",       "Accept-Encoding": "gzip, deflate, sdch",       "Host": "localhost:8888",       "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",       "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36",       "Connection": "keep-alive",       "Upgrade-Insecure-Requests": "1"     } [E 17:53:52.819 NotebookApp] 500 GET /tree (::1) 874.29ms referer=None 

---

EDIT

When attempting to update ipython as advised, the following error message was produced:

Exception: Traceback (most recent call last):   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip/basecommand.py", line 209, in main     status = self.run(options, args)   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip/commands/install.py", line 317, in run     prefix=options.prefix_path,   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip/req/req_set.py", line 732, in install     **kwargs   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip/req/req_install.py", line 835, in install     self.move_wheel_files(self.source_dir, root=root, prefix=prefix)   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip/req/req_install.py", line 1030, in move_wheel_files     isolated=self.isolated,   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip/wheel.py", line 247, in move_wheel_files     prefix=prefix,   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip/locations.py", line 142, in distutils_scheme     i = d.get_command_obj('install', create=True)   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 845, in get_command_obj     klass = self.get_command_class(command)   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/setuptools/dist.py", line 430, in get_command_class     self.cmdclass[command] = cmdclass = ep.load()   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2229, in load     return self.resolve()   File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2235, in resolve     module = __import__(self.module_name, fromlist=['__name__'], level=0) ImportError: No module named command.install 

Answer 1

Try upgrading jupyter hub first:

$ pip install --upgrade jupyterhub $ pip install --upgrade --user nbconvert 

If you are inside a conda environment, run the following command instead.

$ conda install nbconvert==5.4.1 

Answer 2

After trying all the solutions on this page without success, a variation of @kruger answer is what worked for me, simply this:

pip install --upgrade nbconvert