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4	4	(% class="wikigeneratedid" %)
5	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/]].
6	6
	7	+== Temporary problems ==
	8	+
	9	+Currently none known.
	10	+
7	7	== Jupyter notebook environment ("Lab") related ==
8	8
9	9	=== Error message "Error in Authenticator.pre_spawn_start: ... 401: Unauthorized" ===
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33	33	[[image:1623846323177-898.png||height="287" width="350"]]
34	34
35	35
36		-=== Test jobs make problems at Jülich ===
	40	+=== Error message: "Could not identify EBRAINS kernel " ===
37	37
38		-Since August 2021 accessing the "Lab" link in the left hand navigation menu brings up a site selection menu:
	42	+If your notebook shows "RuntimeError: Could not identify EBRAINS kernel (probably too old version). Please select the appropriate kernel EBRAINS_experimental_release.": Please check, whether an EBRAINS kernel has been selected as kernel for the notebook execution.  In the example screenshot below the "Python 3 (ipykernel)" has been used, as shown in the upper right hand corner of the tab with the notebook.
39	39
40		-[[image:Screenshot 2021-08-30 at 19.00.59.png||height="252" width="300"]]
	44	+[[image:1666184857320-440.png]]
41	41
42		-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.
43	43
	47	+Fix: click the current kernel name to get the kernel selection dialog box and select the "EBRAINS_experimental_release" kernel (blue highlight in the screenshot shown below):
44	44
45		-=== ===
	49	+[[image:image-20221019150927-1.png]]
46	46
	51	+(% class="wikigeneratedid" %)
	52	+=== Import error for hbp_service_client ===
47	47
48		-
	54	+The hbp_service_client was needed for the now not-existing-any-longer Collaboratory version 1. The import line can be deleted from scripts.
49	49
50	50	== BrainScaleS-2 specific ==
51	51

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