Arduino UNO As A MIDI Keyboard

Still the same
Error message is
:72:30: error: conflicting declaration 'CS::Bankable::NoteButton buttons []'

Bankable::NoteButton buttons[] {

                          ^

note: previous declaration as 'CS::NoteButton buttons [25]'

NoteButton buttons[] = {

         ^~~~~~~

exit status 1

conflicting declaration 'CS::Bankable::NoteButton buttons []'