The error was syntax error : .notdef is not a valid glyph name

1

Referenced by feature “AccessAllAlternates1”

Referenced by feature “AccessAllAlternates2”

Referenced by feature “AccessAllAlternates3”

sub .notdef -> uniE000;
sub Euro -> _225;
sub yen -> _226;
sub copyright -> _

2

Why do you want to substitute .notdef?
Can you paste the feature code that does the substitution?