Chapter 9 - borderless frames w/ JPG not working

Using Xcode 13 beta 2 — when attempting to run the app after adding one borderless frame that houses a JPG - I see a series of errors in the console about Resolving material name ‘xxx’ as an asset path — usage is deprecated; instead provide a valid bundle…

Hmmm. In code I’m simply calling Experience.loadBox() (where Box is the name of my scene that includes the borderless frame)

Any thoughts (other than avoid beta software?)???