Is it not possible to give access like this IF the users don't have EDIT permission to the contact record the button is on?
답변 7개
Stefanie,
What happens if you do give these community users edit permissions? Does the error go away?
INSUFFICIENT_ACCESS is generally a permissions issue steming from a CRUD related permission or sometimes a profile permission is needed.
This post - https://developer.salesforce.com/forums/?id=906F000000095q0IA - Suggests that the Force.com Site user needs access to the class as well.
Cheers,
James