Calendar component issue

I'm trying to integrate the microsoft exchange calendar with rollbase, i already set the Third Party Settings but the calendar do not return the meetings  (events/tasks)  

I have in my calendar and the tasks and meeting i create in the rollbase, they are not added to my calendar

the only error i get is the

Unknown DataSource transport type 'json'.
Verify that registration scripts for this type are included after Kendo UI on the page.