This package has been under development since 2017, and has been continuously updated, so starting from a new base file is not an option. I don't know which original version it started as.
I downloaded the newest build of M1 Build (1.4.0.239), and all of the previous errors went away, however, now when I try to validate the project, I get an error message pop up that doesn't go away after 100+ times clicking OK--I assume because there are 100+ warning messages. It says "Program Warning. Internal Warning - Notification delivery blocked."