problem when i need to save

jisukoo​  Can you use "save as" rather than "save"?  If that doesn't work, try it again but with your Mods folder removed.  Since you're using "save as," you won't overwrite your original save, so you don't need to worry about the effects of the missing mods and custom content.

If that doesn't work either, please create a new save and see whether you can save that.  The point is to see whether the problem is limited to your main save or is more global.