Undefined font-weight error

Hello,

We had to revert to evolve because evolve+ crashed for some reason.
Current, from the Customize section, we see numerous lines of this repeated error: “Notice: Undefined index: font-weight in /home4/ontarion/public_html/wp-content/themes/evolve/library/functions/basic-functions.php on line 1478”

I have looked in the Editor sector and can not see “basic-functions.php”

How can we find the php and how can this be resolved?

best,

Noah