Getting 'Error: AppleEvent handler failed' every time I run this script in Script Editor - macos

Question

Been struggling to get this script to work. It's meant to batch export notes out of Apple Notes. Script is below.
// set things up
var app = Application.currentApplication();
app.includeStandardAdditions = true;
var notesApp = Application('Notes');
notesApp.includeStandardAdditions = true;
// choose which notes
var notes = notesApp.notes;
var whichNotes = app.chooseFromList(notes.name(), { withPrompt: "Which Notes?", multipleSelectionsAllowed: true });
if (whichNotes) {
// choose save location
var saveWhere = app.chooseFolder().toString();
if (saveWhere) {
// loop through all notes
for(var i=0; i<notes.length; i++) {
// is this note one to be exported?
if (whichNotes.indexOf(notes[i].name()) > -1) {
// save file as html
var filename = saveWhere+"/"+notes[i].name()+".html";
var file = app.openForAccess(Path(filename), { writePermission: true });
app.setEof(file, { to: 0 });
app.write(notes[i].body(), {to: file});
app.closeAccess(file);
}
}
}
}
A bunch of other people have used it with no problems.

Answer 1

I have the same problem with the same script on 10.15.7. The issue is raised on notes.name().
I assume this is related to either too many notes (it used to work, but I created a lot of notes since), or some special char in the note title. But I did not managed to fix it with my notes.
I copied my version below.
(notice the replace to build a valid file name if your note title contain "/".)
// set things up
var app = Application.currentApplication();
app.includeStandardAdditions = true;
var notesApp = Application('Notes');
notesApp.includeStandardAdditions = true;
// choose which notes
var notes = notesApp.notes;
this.console.log("before notes.name()")
var whichNotes = app.chooseFromList(notes.name(), { withPrompt: "Which Notes?", multipleSelectionsAllowed: true });
this.console.log("After notes.name()")
this.console.log("Let's do it") // view / show log / message tab
if (whichNotes) {
// choose save location
var saveWhere = app.chooseFolder().toString();
if (saveWhere) {
this.console.log("note count:"+notes.length)
// loop through all notes
for(var i=0; i<notes.length; i++) {
// is this note one to be exported?
if (whichNotes.indexOf(notes[i].name()) > -1) {
// save file as html
var notename = notes[i].name().replace(/\//gi,'-')
this.console.log("next:"+notename) // view / show log / message tab
var filename = saveWhere+"/"+ notename +".html";
var file = app.openForAccess(Path(filename), { writePermission: true });
app.setEof(file, { to: 0 });
app.write(notes[i].body(), {to: file});
app.closeAccess(file);
}
}
}
}