Problems with template Multiscreen Slideshow for FCPX

Hi all, I have a big problem with
Multiscreen Slideshow || FCPX
|| FCPX at this link:

A large editing project has come to a standstill because the template no longer works and the red screen appears as per the attached screenshot. Does anyone have a solution? Can you help me?
I’m using the latest version of FCPX with m1 Mac
Thanks bye Roberto