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	2	+This page collects some more commonly encountered problems when using the systems via the Collaboratory.
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	5	+For more information on the Collaboratory, please seee the [[documentation of the EBRAINS Collaboratory environment>>https://wiki.ebrains.eu/bin/view/Collabs/the-collaboratory/]].
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1	1	== Jupyter notebook environment ("Lab") related ==
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3	3	=== Error message "Error in Authenticator.pre_spawn_start: ... 401: Unauthorized" ===
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9	9	=== No example notebooks in the Jupyter notebook environment ("Lab") ===
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11		-When starting the Jupyter notebook environment for the first time it takes about a minute (without visible "in progress" indication) until the example files appear in the file-chooser. Until then the list is just empty. So the fix here is "have a minute patience", then click the "Lab" link again.
	17	+When starting the Jupyter notebook environment for the first time it can take a bit (without visible "in progress" indication) until the example files appear in the file-chooser. Until then the list is just empty. So the fix here is "have a minute patience", then click the "Lab" link again.
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13	13	[[image:NoFiles.png]]
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15	15	=== Timeout when starting the Jupyter notebook environment ("Lab") ===
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17		-It is possible, that accessing the "Lab" link results in a "timeout" message. This can happen, when the lab environment is started for the first time on one of the virtual machines providing the service, as the very first start per machine takes quite some time (in the order of 2 minutes). Accessing the "Lab" link again after a few minutes usually works.
	23	+It is possible, that accessing the "Lab" link results in a "timeout" message. This can happen, when the lab environment is started for the first time on one of the virtual machines providing the service, as the very first start per machine takes some time (in the order of 2 minutes). Accessing the "Lab" link again after a few minutes usually works.
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19	19	=== Lab error message "Cannot open - Could not find path..." ===
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27	27	[[image:1623846323177-898.png||height="287" width="350"]]
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29	29
30		-=== Test jobs make problems at Jülich ===
	36	+=== Import error for hbp_service_client ===
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32		-Since August 2021 accessing the "Lab" link in the left hand navigation menu brings up a site selection menu:
	38	+The hbp_service_client was needed for the now not-existing-any-longer Collaboratory version 1. The import line can be deleted from scripts.
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34		-[[image:Screenshot 2021-08-30 at 19.00.59.png||height="252" width="300"]]
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36		-Via choosing a different lab execution site it is be possible to choose a specific site, if there are specific needs for the created Jupyter virtual machine for a given task (e.g. a large memory requirement). Currently all the examples do not need any site specific features, so you can select in principle any site. The "safe choice" is to use CSCS as the primary execution site.
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39		-=== ===
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41		-
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43		-
44	44	== BrainScaleS-2 specific ==
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46	46	The [[BrainScaleS external user chat>>https://chat.bioai.eu/external-users/channels/town-square]] has service announcements (e.g. when a system is down due to maintenance) and is also a good place to ask general questions.
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95	95
96	96	There are also some additional Python3 related changes in the brainscales_system_chain_test.py example. Please find a [[working example script>>https://lab.ch.ebrains.eu/user-redirect/lab/tree/shared/NMC%20Collab%20copy%20template/BrainScaleS/BrainScaleS_01_Chain.ipynb]] in our [[copy-template Drive>>https://wiki.ebrains.eu/bin/view/Collabs/nmc-collab-copy-template/Drive]] (for copying into users collabs).
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	95	+==== ====