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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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69	69	The BrainScaleS-2 interactive examples need the BrainScaleS client software. Currently (December 2021) this software is not available from the started-by-default "Python 3" kernel in the Jupyter lab, but requires the "EBRAINS_release_...." kernel. Please choose the kernel by clicking the kernel name in the lower left hand corner of the Lab window ("Python 3" in the screenshot)
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71		-[[image:1639576461861-804.png]]
	77	+[[image:1639576461861-804.png||height="42" width="456"]]
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73	73	Then select the "EBRAINS_release_..." kernel from the dialog box and run the example again.
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75		-[[image:1639576524483-695.png]]
	81	+[[image:1639576524483-695.png||height="259" width="420"]]
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	83	+It may be necessary to restart the newly chosen kernel via "Kernel > restart Kernel" from the menu.
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	85	+[[image:1639576718553-361.png||height="125" width="518"]]
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77	77	== BrainScaleS-1 specific ==
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79	79	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.