Grading API Events
detachitem:error
Fired when the public method gradingApp.detachItem() has thrown an error.
You would want to be notified about this event firing, because you might want to update your application UI to indicate that the detaching of the attached Item has encountered an error, for example.
Examples
gradingApp.on('detachitem:error', function () {
console.log('attachItem fail');
});