Hi there, 

I am trying to use a Workflow to send an email on Lead creation. 

Everything works fine, except that there will be an error: 

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MissingError

One of the documents you are trying to access has been deleted, please try again after refreshing.

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This error will only appear when I set up an email to be sent. The workflow works fine otherwise.

Our SMTP server works fine (connection tests are successful).

Thank you for your time.