"Association Rules Analysis" triggers 'TRANSIENT_FAILURE' with any dataset

[dave-espinosa]

Describe the bug
Good day,

I am using the Association Rules Analysis with Efficient-Apriori segment of PyTools. I have already managed to run successfully the example provided using the UCI Online Retail dataset. I have also generated my own "Association Rules.qvd" file with the mentioned UCI dataset, without any issues at all (well, other than that weird behaviour of Efficient-Apriori algorithm, taking a considerable amount of time to process even small datsets). However and for some reason, when I try to generate the "Association Rules.qvd" with my own dataset, it triggers the following message: "The following error occurred:
Connector reply error: grpc::StatusCode::UNAVAILABLE: 'channel is in state TRANSIENT_FAILURE'". And I keep getting that exact same message, regardeless of the dataset I am trying. I have tried to look for that error in Stack Overflow and Qlik Help, but even when I have stumbled upon some slightly related issues, there is nothing alike to this. What am I missing?

To Reproduce
Steps to reproduce the behavior:
2. Follow installation rules described here. Make sure 'Qlik-Py-Start.bat' is running.
3. Download & unzip the following files to some local directory of your own. You might need to take 'MBA_ECU_QUARTER.qvf' file to the directory which keeps Qlik Apps (i.e., in my case, it was 'C:\Users\david\Documents\Qlik\Sense\Apps', you need to check your own connection).
4. Download all the data sources to the same directory than Step 3.
5. Open Qlik Sense, you should see by now an app called 'MBA_ECU_QUARTER'. Open it, and create a data connection named 'AttachedFiles', making sure in points to the same directory than Step 3.
6. Tab 'Prepare' --> 'Data load editor' --> Clik button 'Load Data'. You should see the script running.

Expected behavior
After some time, you should see a file called "Association Rules.qvd" in the directory mentioned on Step 3.

Screenshots
I think the issue is self-explanatory. I will provide screenshots if needed, under specification.

Environment:

• OS: Windows 10 Pro, Version 20H2, Compilation 19042.985, Windows Feature Experience Pack 120.2212.2020.0
• Qlik Sense Desktop Version: November 2020 Patch 8

Additional context
Other than the UCI Dataset and the Lord of the Rings (with an homonym dataset), no other dataset could generate the "Association Rules.qvd" files.