Contact field tokens in subject line

Your software
My Mautic version is:3.3.2
My PHP version is: 7.4
My Database type and version is: MySQL 15.1

Your problem
My problem is: I am trying to put the first name in the subjectline {contactfield=firstname}. Its not working. How do I fix this?

These errors are showing in the log:

Steps I have tried to fix the problem: