Server Connection Error 500 with Jupyter Lab

Question

I have installed Jupyter Lab but when I launch it I get an error: "Server Connection Error Invalid response: 500 Internal Server Error"

My python set up is Anaconda which probably has something to do with this.

Full error message from command line:

jupyter lab

[I 11:09:41.874 LabApp] [jupyter_nbextensions_configurator] enabled 0.2.8

[I 11:09:41.884 LabApp] JupyterLab beta preview extension loaded from /anaconda/lib/python3.6/site-packages/jupyterlab

[I 11:09:41.884 LabApp] JupyterLab application directory is /anaconda/share/jupyter/lab

[W 11:09:41.887 LabApp] JupyterLab server extension not enabled, manually loading...

[I 11:09:41.888 LabApp] JupyterLab beta preview extension loaded from /anaconda/lib/python3.6/site-packages/jupyterlab

[I 11:09:41.888 LabApp] JupyterLab application directory is /anaconda/share/jupyter/lab

[I 11:09:41.896 LabApp] Serving contents

[I 11:09:41.896 LabApp] 0 active kernels

[I 11:09:41.896 LabApp] The Jupyter Notebook is running at: http://localhost:8888/?token=ad00b52a346b46663662980c13b3da3edb1ecf8614ef1237

[I 11:09:41.896 LabApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).

[C 11:09:41.897 LabApp]
Copy/paste this URL into your browser when you connect for the first time,
to login with a token:
    http://localhost:8888/?token=ad00b52a346b46663662980c13b3da3edb1ecf8614ef1237
[I 11:09:42.090 LabApp] Accepting one-time-token-authenticated connection from ::1

[W 11:09:42.740 LabApp] Could not determine jupyterlab build status without nodejs

[E 11:09:42.748 LabApp] Unhandled error in API request Traceback (most recent call last): File "/anaconda/lib/python3.6/site-packages/notebook/base/handlers.py", line 516, in wrapper result = yield gen.maybe_future(method(self, *args, **kwargs)) File "/anaconda/lib/python3.6/site-packages/tornado/gen.py", line 1055, in run value = future.result() File "/anaconda/lib/python3.6/site-packages/tornado/concurrent.py", line 238, in result raise_exc_info(self._exc_info) File "", line 4, in raise_exc_info File "/anaconda/lib/python3.6/site-packages/tornado/gen.py", line 1069, in run yielded = self.gen.send(value) File "/anaconda/lib/python3.6/site-packages/notebook/services/contents/handlers.py", line 126, in get if model['type'] == 'directory' and content: TypeError: list indices must be integers or slices, not str

[E 11:09:42.753 LabApp] { "Host": "localhost:8888", "Connection": "keep-alive", "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36", "Authorization": "token ad00b52a346b46663662980c13b3da3edb1ecf8614ef1237", "Content-Type": "application/json", "Accept": "/", "Referer": "http://localhost:8888/lab", "Accept-Encoding": "gzip, deflate, br", "Accept-Language": "en-GB,en-US;q=0.9,en;q=0.8", "Cookie": "_xsrf=2|a0d1ccab|73a01490f127ec24c30835607aea1050|1520242814; username-localhost-8888=\"2|1:0|10:1521630582|23:username-localhost-8888|44:MTQwZDBhNzZlYzY5NDIxZWIyNzUxMWNkMzczZWNiMWU=|79900638f4dc105393e048f2236331a6f46520ff43b4ff010066d0196b260a00\"" }

[E 11:09:42.753 LabApp] 500 GET /api/contents/?content=1&1521630582746 (::1) 5.28ms referer=http://localhost:8888/lab

[W 11:11:05.761 LabApp] Could not determine jupyterlab build status without nodejs

[E 11:11:05.770 LabApp] Unhandled error in API request Traceback (most recent call last): File "/anaconda/lib/python3.6/site-packages/notebook/base/handlers.py", line 516, in wrapper result = yield gen.maybe_future(method(self, *args, **kwargs)) File "/anaconda/lib/python3.6/site-packages/tornado/gen.py", line 1055, in run value = future.result() File "/anaconda/lib/python3.6/site-packages/tornado/concurrent.py", line 238, in result raise_exc_info(self._exc_info) File "", line 4, in raise_exc_info File "/anaconda/lib/python3.6/site-packages/tornado/gen.py", line 1069, in run yielded = self.gen.send(value) File "/anaconda/lib/python3.6/site-packages/notebook/services/contents/handlers.py", line 126, in get if model['type'] == 'directory' and content: TypeError: list indices must be integers or slices, not str

[E 11:11:05.770 LabApp] { "Host": "localhost:8888", "Connection": "keep-alive", "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36", "Authorization": "token ad00b52a346b46663662980c13b3da3edb1ecf8614ef1237", "Content-Type": "application/json", "Accept": "/", "Referer": "http://localhost:8888/lab", "Accept-Encoding": "gzip, deflate, br", "Accept-Language": "en-GB,en-US;q=0.9,en;q=0.8", "Cookie": "_xsrf=2|a0d1ccab|73a01490f127ec24c30835607aea1050|1520242814; username-localhost-8888=\"2|1:0|10:1521630665|23:username-localhost-8888|44:Y2JlODAxNzA3MDY4NDIwYWE4YTM5NGZlZDNhMThlYjE=|7ae8038d90bbf8f4d44811f23462b14cce1e930fc7f000b31c01e68a84245818\"" }

[E 11:11:05.770 LabApp] 500 GET /api/contents/?content=1&1521630665767 (::1) 1.21ms referer=http://localhost:8888/lab

[E 11:12:45.773 LabApp] Unhandled error in API request Traceback (most recent call last): File "/anaconda/lib/python3.6/site-packages/notebook/base/handlers.py", line 516, in wrapper result = yield gen.maybe_future(method(self, *args, **kwargs)) File "/anaconda/lib/python3.6/site-packages/tornado/gen.py", line 1055, in run value = future.result() File "/anaconda/lib/python3.6/site-packages/tornado/concurrent.py", line 238, in result raise_exc_info(self._exc_info) File "", line 4, in raise_exc_info File "/anaconda/lib/python3.6/site-packages/tornado/gen.py", line 1069, in run yielded = self.gen.send(value) File "/anaconda/lib/python3.6/site-packages/notebook/services/contents/handlers.py", line 126, in get if model['type'] == 'directory' and content: TypeError: list indices must be integers or slices, not str [E 11:12:45.774 LabApp] { "Host": "localhost:8888", "Connection": "keep-alive", "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36", "Authorization": "token ad00b52a346b46663662980c13b3da3edb1ecf8614ef1237", "Content-Type": "application/json", "Accept": "/", "Referer": "http://localhost:8888/lab", "Accept-Encoding": "gzip, deflate, br", "Accept-Language": "en-GB,en-US;q=0.9,en;q=0.8", "Cookie": "_xsrf=2|a0d1ccab|73a01490f127ec24c30835607aea1050|1520242814; username-localhost-8888=\"2|1:0|10:1521630765|23:username-localhost-8888|44:ODFhYWQ3ZDU5OWE5NDdmYTlkODhkNmMxYzg2MDlkYWI=|0dc6d8a192c6e5494080ca950923b1b291086c2d87c2fbcd709488469ac03370\"" }

[E 11:12:45.774 LabApp] 500 GET /api/contents/?content=1&1521630765770 (::1) 1.80ms referer=http://localhost:8888/lab

[E 11:14:26.770 LabApp] Unhandled error in API request Traceback (most recent call last): File "/anaconda/lib/python3.6/site-packages/notebook/base/handlers.py", line 516, in wrapper result = yield gen.maybe_future(method(self, *args, **kwargs)) File "/anaconda/lib/python3.6/site-packages/tornado/gen.py", line 1055, in run value = future.result() File "/anaconda/lib/python3.6/site-packages/tornado/concurrent.py", line 238, in result raise_exc_info(self._exc_info) File "", line 4, in raise_exc_info File "/anaconda/lib/python3.6/site-packages/tornado/gen.py", line 1069, in run yielded = self.gen.send(value) File "/anaconda/lib/python3.6/site-packages/notebook/services/contents/handlers.py", line 126, in get if model['type'] == 'directory' and content: TypeError: list indices must be integers or slices, not str

[E 11:14:26.771 LabApp] { "Host": "localhost:8888", "Connection": "keep-alive", "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36", "Authorization": "token ad00b52a346b46663662980c13b3da3edb1ecf8614ef1237", "Content-Type": "application/json", "Accept": "/", "Referer": "http://localhost:8888/lab", "Accept-Encoding": "gzip, deflate, br", "Accept-Language": "en-GB,en-US;q=0.9,en;q=0.8", "Cookie": "_xsrf=2|a0d1ccab|73a01490f127ec24c30835607aea1050|1520242814; username-localhost-8888=\"2|1:0|10:1521630865|23:username-localhost-8888|44:MDNhNGVlZjQxZGYxNGZmN2I3ZjIyNmYzMTI2MDE5ZDI=|700d7876594cb797ba50d10173ed9132af5988cb1c0dc82aba0ded957fef24e5\"" }

[E 11:14:26.772 LabApp] 500 GET /api/contents/?content=1&1521630866769 (::1) 1.59ms referer=http://localhost:8888/lab [E 11:16:07.776 LabApp] Unhandled error in API request Traceback (most recent call last): File "/anaconda/lib/python3.6/site-packages/notebook/base/handlers.py", line 516, in wrapper result = yield gen.maybe_future(method(self, *args, **kwargs)) File "/anaconda/lib/python3.6/site-packages/tornado/gen.py", line 1055, in run value = future.result() File "/anaconda/lib/python3.6/site-packages/tornado/concurrent.py", line 238, in result raise_exc_info(self._exc_info) File "", line 4, in raise_exc_info File "/anaconda/lib/python3.6/site-packages/tornado/gen.py", line 1069, in run yielded = self.gen.send(value) File "/anaconda/lib/python3.6/site-packages/notebook/services/contents/handlers.py", line 126, in get if model['type'] == 'directory' and content: TypeError: list indices must be integers or slices, not str

[E 11:16:07.777 LabApp] { "Host": "localhost:8888", "Connection": "keep-alive", "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36", "Authorization": "token ad00b52a346b46663662980c13b3da3edb1ecf8614ef1237", "Content-Type": "application/json", "Accept": "/", "Referer": "http://localhost:8888/lab", "Accept-Encoding": "gzip, deflate, br", "Accept-Language": "en-GB,en-US;q=0.9,en;q=0.8", "Cookie": "_xsrf=2|a0d1ccab|73a01490f127ec24c30835607aea1050|1520242814; username-localhost-8888=\"2|1:0|10:1521630965|23:username-localhost-8888|44:MDc0MjlmODBlYTM4NDBjZDhlZjgyOTEzYTA2OTExMmU=|997eec50aacef9512c6adb31f8badfa3145c86c13b0d45914585a5a62c852e11\"" }

[E 11:16:07.777 LabApp] 500 GET /api/contents/?content=1&1521630967773 (::1) 1.71ms referer=http://localhost:8888/lab

so.. this problem has gone away. But I do not know what solved it, as the list of things changed includes getting a new laptop! — Johnny V, Jun 26 '19 at 11:34

Server Connection Error 500 with Jupyter Lab

0 Answers0