Copy and paste your code here after making the changes I mentioned and I'll amend the code.

Remove the first line called Element and just copy the attribute, in the schema structure you can only have one wrapper called element with all the attributes inside of it. Here is the schema structure documentation https://experienceleague.adobe.com/docs/campaign-classic/using/configuring-campaign-...

Raising a ticket to Adobe Customer Care will be the first step, they will guide you through the migration process.Migration to Public Cloud FAQhttps://experienceleague.adobe.com/docs/campaign-classic/using/technotes/dc-migration/dc-migration-faq.html?lang=en  

The error is clear  

I've got this very old document in french that shows you how to achieve that, I've translated the first 3 pages, you may continue to translate the rest.

https://experienceleague.adobe.com/docs/campaign-standard/using/managing-processes-and-data/targeting-activities/segmentation.html?lang=en See in documentation and search for segmentation.

https://experienceleague.adobe.com/docs/campaign-classic/using/monitoring-campaign-classic/production-procedures/log-files.html?lang=en Each nlserver module generates a log file saved in the following directory: <installation directory>/var/<instance>/log/<module>.log.web.logWeb module logs (client ...

I believe that happens in the case the workflow is not running, but I will check internally for more info, can you post exactly what sort of behaviour you are facing. and also, whats the average processing time of each event by the workflow containing the signal. If the target workflow is suspended ...

As far as I know; getImageUrl only accepts one argument, and thats the ID or internal name of the file.

By looking at the timeline and behaviour, It seems that while there is a network issue in the backend, the records actually does get stored in the table XtkFileRes and upon clicking OK, the process retries the request and at this point the unique violation constraints is triggered as the record did ...