I have the answer
Thankfully, this has a rather straightforward fix.
1. Open Terminal. (
2. Quit the Notes.app.
3. Enter in the terminal WITHOUT the quotes "
rm -rf ~/Library/Containers/com.apple.Notes"
This probably will work.
it may switch the icloud option for notes off so to solve this go to
System prefrences/mail contacts & calanders/icloud... make sure notes is ticked.
Let me know if this workes.