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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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7	7	== Jupyter notebook environment ("Lab") related ==
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9	9	=== Error message "Error in Authenticator.pre_spawn_start: ... 401: Unauthorized" ===
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15	15	=== No example notebooks in the Jupyter notebook environment ("Lab") ===
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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.
	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.
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19	19	[[image:NoFiles.png]]
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21	21	=== Timeout when starting the Jupyter notebook environment ("Lab") ===
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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.
	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.
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25	25	=== Lab error message "Cannot open - Could not find path..." ===
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45	45	=== ===
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	43	+
50	50	== BrainScaleS-2 specific ==
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52	52	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.