errors when deleting assets

Unity Engine
1

My main game project is 3.6 GB, impossible to load from a DVD, so I decided to delete some parts of it, and just
import the small pieces I actually need of those plugins. I deleted JMO particles and Skele character editor and got these errors.

Assets/sharedassets0.asset(1,3): error CS8025: Parsing error

Assets/sharedassets0.asset(1,1): BCE0044: unexpected char: 0x0.

When I copied JMO particles and skele back in from my backup, the errors disappeared. How do fix this?

sharedassets0.asset is a 57MB file.

2

quote
the errors disappeared. How do fix this?
unquote
Then they came back.

3

All 3 projects (even the one I deleted from) lost that error after reimporting assets, 45 minutes each, shouldn’t happen.

4

I’m screwed, any addition or subtraction of files from my project generates the errors. Sharedassets0.asset file size
never changes