Changes for page Troubleshooting

Last modified by kindler on 2025/05/14 16:54
From version 48.1
edited by kindler
on 2023/08/04 13:11
Change comment: There is no comment for this version
To version 36.1
edited by kindler
on 2021/12/15 14:58
Change comment: There is no comment for this version

Summary

Details

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2 -This page collects some more commonly encountered problems when using the systems via the Collaboratory.
3 -
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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/]].
6 -
7 -== Temporary problems ==
8 -
9 -Currently none known.
10 -
11 11  == Jupyter notebook environment ("Lab") related ==
12 12  
13 13  === Error message "Error in Authenticator.pre_spawn_start: ... 401: Unauthorized" ===
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18 18  
19 19  === No example notebooks in the Jupyter notebook environment ("Lab") ===
20 20  
21 -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.
22 22  
23 23  [[image:NoFiles.png]]
24 24  
25 25  === Timeout when starting the Jupyter notebook environment ("Lab") ===
26 26  
27 -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.
28 28  
29 29  === Lab error message "Cannot open - Could not find path..." ===
30 30  
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37 37  [[image:1623846323177-898.png||height="287" width="350"]]
38 38  
39 39  
40 -=== Error message: "Could not identify EBRAINS kernel " ===
30 +=== Test jobs make problems at Jülich ===
41 41  
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.
32 +Since August 2021 accessing the "Lab" link in the left hand navigation menu brings up a site selection menu:
43 43  
44 -[[image:1666184857320-440.png]]
34 +[[image:Screenshot 2021-08-30 at 19.00.59.png||height="252" width="300"]]
45 45  
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.
46 46  
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):
48 48  
49 -[[image:image-20221019150927-1.png]]
39 +=== ===
50 50  
51 -(% class="wikigeneratedid" %)
52 -=== Import error for hbp_service_client ===
53 53  
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.
55 55  
43 +
56 56  == BrainScaleS-2 specific ==
57 57  
58 58  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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94 94  
95 95  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.
96 96  
97 -(% class="wikigeneratedid" %)
98 -=== Jobs for wafer 33 fail with "Slurm execution failed with state CANCELLED by 0" ===
99 -
100 -Wafer 33 is currently (August 2023) not available for use from the EBRAINS Collaboratory via the NMPI batch system. Please use wafer 30 instead.  The copy template for the example job has been updated to use wafer 30.
101 -
102 102  === //PyMarocco.None// needs to be changed to //PyMarocco.Without (Nov 2021)// ===
103 103  
104 104  November 2021: //marocco.backend = PyMarocco.None// had to be changed to //marocco.backend = PyMarocco.Without// due to the move to Python3, which has None as a reserved keyword. See also [[this FAQ entry in the guidebook>>https://electronicvisions.github.io/hbp-sp9-guidebook/pm/using_pm_newflow.html#rename-pymarocco-none-to-pymarocco-without]].
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