Hello @TinaY91 !
We apologize that you are encountering this error. What is the name of the campaign as it shows in Constant Contact?
It sounds like we are using a 2GE or Legacy Email format, are you familiar with code or able to view if there are any issues in the HTML?
If not, have we tried using a different browser or incognito mode?
Adelina R
Community & Social Media Support
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