Would be helpful to see the actual query and schema definition, but from error, I can tell, that it expects the group element to be presented in temp:group schema and it is not there. So there should be an error in XTK expression.
Thank you. I just checked and it seems that this workflow has is running, but the credentials for the sFTP are incorrect. I feel like this could be the cause of the issue, I will reach out to my Adobe contact to retrieve new credentials and keep you guys posted.
thats one of the things that bugs me about campaign, whatever error it throws is not necessarily whats broken