Changes for page Troubleshooting

Last modified by kindler on 2025/05/14 16:54
From version 33.1
edited by kindler
on 2021/12/15 14:55
Change comment: Uploaded new attachment "1639576524483-695.png", version {1}
To version 41.1
edited by kindler
on 2022/08/19 15:21
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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/]].
6 +
7 +== Temporary problems ==
8 +
9 +=== August 2022: "504 Gateway Time-out" ===
10 +
11 +The call to //client.list_resource_requests(repoInfo.nameInTheUrl)// in the batch-exmaple notebooks currently (19 August 2022) result in a "504 Gateway Time-out" error due to a problem in the back-end. As a workaround, please just skip the part by inserting a line with the content
12 +//exit()//
13 +before the line
14 +//a=client.list_resource_requests(repoInfo.nameInTheUrl)//
15 +in the example notebook. This skips the pre-check for an existing quota (so, if a quota entry is missing the execution will fail later), but allows the notebook to run, if a quota entry is present (which is the usual case).
16 +
1 1  == Jupyter notebook environment ("Lab") related ==
2 2  
3 3  === Error message "Error in Authenticator.pre_spawn_start: ... 401: Unauthorized" ===
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8 8  
9 9  === No example notebooks in the Jupyter notebook environment ("Lab") ===
10 10  
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"
27 +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.
12 12  
13 13  [[image:NoFiles.png]]
14 14  
15 15  === Timeout when starting the Jupyter notebook environment ("Lab") ===
16 16  
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.
33 +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.
18 18  
19 19  === Lab error message "Cannot open - Could not find path..." ===
20 20  
21 -When first opening the Lab it is possible, that it can not open the path /shared/name-of-the-collab, even though in the drive the path is already accessible (see the two screenshots below from the Lab and the Drive). This is due to some delay in synchronisation between the file systems. Fix: Wait a few minutes and try again... (If that does not fix the problem, please contact support@ebrains.eu)
37 +When first opening the Lab it is in rare cases possible, that it can not open the path /shared/name-of-the-collab, even though in the drive the path is already accessible (see the two screenshots below from the Lab and the Drive). This is due to some delay in synchronisation between the file systems. Fix: Wait a few minutes and try again.
22 22  
23 -
24 24  [[image:1623846216460-541.png]]
25 25  
26 26  In the "Drive" the path is visible:
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28 28  [[image:1623846323177-898.png||height="287" width="350"]]
29 29  
30 30  
31 -=== Test jobs make problems at Jülich ===
46 +=== Import error for hbp_service_client ===
32 32  
33 -Since August 2021 accessing the "Lab" link in the left hand navigation menu brings up a new site selection menu:
48 +The hbp_service_client was needed for the now not-existing-any-longer Collaboratory version 1. The import line can be deleted from scripts.
34 34  
35 -[[image:Screenshot 2021-08-30 at 19.00.59.png||height="252" width="300"]]
36 36  
37 -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. BUT (as of end of August 21) there is a sporadic problem with the NMPI communication, if running at Jülich. Thus for now, please use CSCS as the primary execution site.
38 -
39 -
40 -=== ===
41 -
42 -
43 -
44 -
45 45  == BrainScaleS-2 specific ==
46 46  
47 47  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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65 65  
66 66  Also since 21 June 2021 a separate quota setting is used for BrainScaleS-2 (visible on the Quota tab in the JobManager)
67 67  
74 +=== BrainScaleS-2 interactive demo does not work with error message "ModuleNotFoundError: No module named 'pynn_brainscales'" ===
75 +
76 +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)
77 +
78 +[[image:1639576461861-804.png||height="42" width="456"]]
79 +
80 +Then select the "EBRAINS_release_..." kernel from the dialog box and run the example again.
81 +
82 +[[image:1639576524483-695.png||height="259" width="420"]]
83 +
84 +It may be necessary to restart the newly chosen kernel via "Kernel > restart Kernel" from the menu.
85 +
86 +[[image:1639576718553-361.png||height="125" width="518"]]
87 +
68 68  == BrainScaleS-1 specific ==
69 69  
70 70  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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