Cannot find "fit" in scope when using contentMode

I’m currently attempting the Lesson 13 Challenge (Bonus Challenge) in the 14 Day Beginner Challenge, yet this is the problem that I encounter:

when I type " .aspectRatio(contentMode: fit)", it says “cannot find ‘fit’ in scope”. This only shows up for this particular line, all other lines seem to be working fine.

Thanks for any help in advance!

Change it to .fit