Recently I'm facing a very annoying issue. Is this a bug? Thanks!
get expression name >>> 
copy to clipboard
edit value >>> 
type "-", paste and press "Enter"
error message
ok the error message, and type "-" and paste again, successAfter this operation, pasting "p9_z" would not causing any error.
But if you change the "p9_z" expression to a new name, e.g. "p9_zz", the first time pasting "p9_zz" would lead to the error message again.