Email Preview Error - Using a Seed Address

[holmes74338504]

Hello, 

Trying to generate a email preview and I get the same error - 

Here's the variable I have coded in the email: 

var effectiveDate = targetData.effectiveDate

And I'm calling it into the email as: <%=formatDate (effectiveDate, "%Bl %D") %>

The seed I'm using is set-up with effectiveDate in the 'Additional Fields' tab: 

I tried changing that Date format to : "2020-04-07" and "2020-04-07 12:00:00.177Z" - both formats still gave me the same error. 

I am on Adobe Console - v7 build 8895

Can anyone help why I would get this error when generating a Preview?

FYI - when I send the email to a select test group - the email delivers fine with no errors. 

[Darren_Bowers · Accepted solution]

formatDate() requires a Date object and in your additional data, date is a string, which will generate that error. I would say your targetData normally has an actual date object for effectiveDate which is why it works when you run the workflow.