Error on sending email to users

Hi! I'm using sendgrid extension to send an email to every users when a new record is added in a table, but it gives an error when debugging.

I'm using the variable from above as an input for the sendgrid function that sends the emails, see below:

But when debugging, I get this error:

I don't know how to remove the "email: " from the variable value used as an input for the email addresses. Do you have any ideas? Thanks

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