Recursive serialization not supported, you can't dereference a PPtr while loading.

So I opened up my project after updating it today, and now I keep getting told that the "Reclusive serialization is not supported’. It was working fine a moment ago, and now it isn’t. Now, I’m relatively new to unity so I have n oI idea how to fix this. I opened up up visual studio and apparently, there were no errors detected. What should I do?

When I opened up visual studio to fix the problem, it said that there were no errors.