Jupyer lab gives Error 500: Internal Server Error

Question

I am pulling my hair out trying to get jupyter lab to run. I previously had it running great, but the machine which was running my server was reset for the first time in months, and since, I am unable to connect to lab.

Jupyter-notbook is working fine.

I have seen various suggestions online to update this and that, to execute jupyter lab build but nothing has helped. I have even tried a fresh install of miniconda, and creating a fresh environment.

I get this output when I try to connect:

p-tau.pauln> conda activate jup-test
(jup-test) np-tau.pauln> jupyter lab --no-browser
[I 2021-02-16 20:07:56.005 ServerApp] jupyterlab | extension was successfully linked.
[I 2021-02-16 20:07:57.561 ServerApp] nbclassic | extension was successfully linked.
[I 2021-02-16 20:07:57.967 LabApp] JupyterLab extension loaded from /home/pauln/.conda/envs/jup-test/lib/python3.9/site-packages/jupyterlab
[I 2021-02-16 20:07:57.967 LabApp] JupyterLab application directory is /home/pauln/.conda/envs/jup-test/share/jupyter/lab
[I 2021-02-16 20:07:57.975 ServerApp] jupyterlab | extension was successfully loaded.
[I 2021-02-16 20:07:57.994 ServerApp] nbclassic | extension was successfully loaded.
[I 2021-02-16 20:07:58.001 ServerApp] Serving notebooks from local directory: /home/pauln
[I 2021-02-16 20:07:58.001 ServerApp] Jupyter Server 1.3.0 is running at:
[I 2021-02-16 20:07:58.001 ServerApp] http://localhost:8888/lab?token=271769cf70c6bee101ab2ebee4e9ef528622afafe1706142
[I 2021-02-16 20:07:58.001 ServerApp]  or http://127.0.0.1:8888/lab?token=271769cf70c6bee101ab2ebee4e9ef528622afafe1706142
[I 2021-02-16 20:07:58.001 ServerApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 2021-02-16 20:07:58.029 ServerApp] 
    
    To access the server, open this file in a browser:
        file:///home/pauln/.local/share/jupyter/runtime/jpserver-59618-open.html
    Or copy and paste one of these URLs:
        http://localhost:8888/lab?token=271769cf70c6bee101ab2ebee4e9ef528622afafe1706142
     or http://127.0.0.1:8888/lab?token=271769cf70c6bee101ab2ebee4e9ef528622afafe1706142
[E 2021-02-16 20:09:19.126 ServerApp] Uncaught exception GET /lab?token=271769cf70c6bee101ab2ebee4e9ef528622afafe1706142 (127.0.0.1)
    HTTPServerRequest(protocol='http', host='localhost:8888', method='GET', uri='/lab?token=271769cf70c6bee101ab2ebee4e9ef528622afafe1706142', version='HTTP/1.1', remote_ip='127.0.0.1')
    Traceback (most recent call last):
      File "/home/pauln/.conda/envs/jup-test/lib/python3.9/site-packages/tornado/web.py", line 1702, in _execute
        result = method(*self.path_args, **self.path_kwargs)
      File "/home/pauln/.conda/envs/jup-test/lib/python3.9/site-packages/tornado/web.py", line 3173, in wrapper
        return method(self, *args, **kwargs)
      File "/home/pauln/.conda/envs/jup-test/lib/python3.9/site-packages/tornado/web.py", line 1878, in wrapper
        return method(self, *args, **kwargs)
      File "/home/pauln/.conda/envs/jup-test/lib/python3.9/site-packages/jupyterlab_server/handlers.py", line 130, in get
        tpl = self.render_template('index.html', page_config=page_config)
      File "/home/pauln/.conda/envs/jup-test/lib/python3.9/site-packages/jupyter_server/base/handlers.py", line 441, in render_template
        template = self.get_template(name)
      File "/home/pauln/.conda/envs/jup-test/lib/python3.9/site-packages/jupyter_server/extension/handler.py", line 13, in get_template
        return self.settings[env].get_template(name)
      File "/home/pauln/apps/clas12root_dg/rcdb/python/jinja2/environment.py", line 791, in get_template
        return self._load_template(name, self.make_globals(globals))
      File "/home/pauln/apps/clas12root_dg/rcdb/python/jinja2/environment.py", line 765, in _load_template
        template = self.loader.load(self, name, globals)
      File "/home/pauln/apps/clas12root_dg/rcdb/python/jinja2/loaders.py", line 125, in load
        code = environment.compile(source, name, filename)
      File "/home/pauln/apps/clas12root_dg/rcdb/python/jinja2/environment.py", line 554, in compile
        self.handle_exception(exc_info, source_hint=source)
      File "/home/pauln/apps/clas12root_dg/rcdb/python/jinja2/environment.py", line 742, in handle_exception
        reraise(exc_type, exc_value, tb)
      File "/home/pauln/apps/clas12root_dg/rcdb/python/jinja2/_compat.py", line 36, in reraise
        raise value.with_traceback(tb)
      File "/home/pauln/.conda/envs/jup-test/share/jupyter/lab/static/index.html", line 1, in 
        JupyterLab{# Copy so we do not modify the page_config with updates. #} {% set page_config_full = page_config.copy() %} {# Set a dummy variable - we just want the side effect of the update. #} {% set _ = page_config_full.update(baseUrl=base_url, wsUrl=ws_url) %}{% block favicon %}{% endblock %}

Paidoo · Accepted Answer

This turned out to be a clash (which I don't fully understand) with some environmental variables I require for Cern's ROOT analysis framework, and some packages which depend on it.

Specifically it seemed to be caused by issues with PYTHON_PATH, JUPYTER_PATH and JUPYTER_CONFIG_DIR.

Jupyer lab gives Error 500: Internal Server Error

Answers (2)

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