Gramps basepath [media import error]

Trying too get help with GRAMPS: I imported a family tree & I got a statement saying to select a simpler base path & I am not sure how to do that. Would like suggestions & help.
I am using GRAMPS 5.1.3 & my operating system is Mac OS 11.1

The Base path for relative Media paths is set in the General tab of the Preferences
From the Edit menu, select Preferences…

What is the value chosen for this setting?