I am new to Qweb templating and following the code in Odoo Development Essentials, I am adding a Kanban view to my project. The program works till i add the following line to my code:

                              <t t-foreach="record.message_follower_ids.raw_value" t-as="rec">                                       

                                  <t t-esc="rec" />;
                               </t>

Then my browser shows the following error:

Odoo Client Error

Error: QWeb2 - template['kanban-box']: Runtime Error: TypeError: dict.record.message_follower_ids is undefined

http://localhost:8069/web/js/web.assets_common/ca89443:1020