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Above info is very conceptual, thanks for sharing. I had exact same error but in Adobe standard Campaign. Its interesting how standard handles this scenario. It creates blank personalized fields in test email sends and we do not have to add any alias or sample data. But when I got same error for actual profile, I found that there were duplicate additional data for same profile and I was using aggregate instead of collection for "Type". Example: One profile registered same webinar twice and using workflow dynamically we were sending webinar reminders to profiles with personalized fields like webinar name, time, join link etc.

During execution, workflow could not determine which personalized values to populate and gave below error:

05/11/2020 7:00:29 AM

Failed

xxxx@xxx.com

Unreachable

Error while compiling script 'DM6926[htmldefaultContent]' line 107: context.targetData is undefined.

No

 

   

Send Status showed: Message Personalization Failed.

I fixed this by changing type to "collection" so that one row of additional data is picked for one profile to populate personalization data fields during execution of workflow.