Error on Boot: "OCS: No schema for Path at 3 Index, context !"

This error message shows up every time I boot my hack, only for a few seconds before the boot picker shows up. Besides that, everything works and the system boots fine. I tried using ocvalidate to investigate the issue, but it says I have to be on OpenCore 0.9.9 (I already am on OpenCore 0.9.9).

Any insight on this would be highly appreciated, thanks!