VideoExport: NoSuchFieldError: You may be using a library that's incompatible with this version of Processing

I followed the trail here for W10 and P4:

NoSuchFieldError: frame on Processing4 · Issue #69 · hamoid/video_export_processing · GitHub

The above directs you to here:
GitHub - hamoid/video_export_processing at kotlinGradle

And I followed the Using the Library instructions.

I now get this instead of an error:

I have not installed FFmpeg to test if it works past this point.

UPDATE

I installed FFmpeg and it now saves a movie but it has this issue:
NullPointerException: it must not be null · Issue #72 · hamoid/video_export_processing · GitHub

Does this KotlinGradle branch work on the Mac?

:)