Token in Subject Line - Error Message

[Elizabeth_Dack]

Hello,

I would like to include a token within my email's subject line "{{lead.First Name,:default= }} Have you read these 6 books?"

However, when i attempt to send a test email with a token within the subject line, I receive the following error messages:

or I receive:

Is anyone aware of how I might fix this? Is it possible that Marketo does not allow the use of tokens within a subject line?

[SanfordWhiteman]

Tokens are fine. Your comma is not: it needs to be outside the curly braces.