TaintedAnimator

I tried this multiple times yet I still have this issue

So, I have this big animation I have been working on for a while now. Its about 8 mins long and has a lot of work put into it. It was working just fine yesterday until I opened it today. Every time I tried to open the project it would just say a fatal error has occurred. Not even my backups are working and now I am confused on what to do. I don't have the motivation to start a whole new project as this one already took a long time. Please help. (Btw there are other projects I have that are shorter, but files are even bigger then the project I'm trying to open and work just fine)

Invalid id 0 in CppProject::Asset::Find:86 Version: 2.0.0 (Windows 10 Version 2009) I'm not a computer person.. so can someone explain to me what is happening?

So I have multiple Wither Storm rigs in my files that I can load but one of them seems to be causing all the textures in the project to go blurry. Making the rig invisible does fix the problem but that isn't what I want. I have no idea if it's a certain piece of the rig making it blurry or its textures or the whole thing in general. It doesn't stay blurry but it will happen from time to time pretty frequently where it will blur every texture in the project. What should I do? Edit: I don't know where I should put this right now so I'm just putting it here unless told to put it elsewhere.