Hello! I am pretty new to Unity and developing for the HoloLens. I have followed the steps in the README up until step 9 where I need to build on Unity. I am running into the following error:

I tried looking for a reference to MatUtils within this repo as well as the OpenCVForUnity repo, and online with no success. I am currently using Unity version 2022.3.22f1 on Windows 10.
Wondering if anyone can point me towards a solution for this? Thanks!