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Alteryx has identified a defect in the 21.3 version which is preventing the alias file from being packaged when workflows are uploaded from Designer to Gallery. Without this alias file, you get this error.
The issue is not related to the saving process. It's the execution, sometimes it fails randomly. My only guess here is that there might be something wrong with the MongoDB. Alteryx support might have better insights on this.
Thanks for your inputs here. What i found after some testing/looking at the logs is that the error occurs always with the same worker node. This seems to explains the "random" part, the ramdoness is related to the queue/availability of the workers.
Now i am waiting for further investigations from the server admin side to confirm that and to know exacly what is wrong with the specific worker.
Yes, we did exactly that. First we started assigning jobs just for the properly configured worker. After that and some further investigations, they claimed that the error is due to having different versions of SQL Server drivers installed on the workers.
Unfortunately they were not able to fix this yet since it is a relatively large environment, but from the business perspective, using just one worker is not a big problem for now.