An error occurs when refreshing layout rules on the Event Configuration Page in CRM Online: Layout Rules Could Not Be Refreshed. Please Review Logs for More Information.
The Event Administrator may lack the Field-Level Security (FLS) read permission to the following fields on the EM_Event_Layout_vod object:
Be sure the Event Administrator has FLS read permission for all these fields mentioned above.
CRM Help Documentation: Event Layout Rules Caching
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