I am trying to add the current month and year to a pdf and thought using the below would work but am getting an errror:

${.now?string('MMMM')} ${.now?string('yyyy')}

What would the correct way to be able to add the current month and year (ex. July 2021)?

?string("format")

seems to be a historical version. see freemarker built-ins for date values:

The desired format can be specified like 

?string.format

 or 

?string["format"]

(or the historical equivalent, 

?string("format")

).

Maybe apostrophes don't work? Try:

${.now?string.MMMM} ${.now?string.yyyy}