Error:

Error Message:

Root Cause:

These errors occur when creating a new contact scheduling calendar or renaming an existing calendar with a duplicate name to another calendar in the organization. 

Solution:

There are two options available to resolve this issue. Either rename the calendar to something new or locate the other calendar to use or delete.

To locate created calendars that have not been published or are inactive, scroll down the page to the filter options and select view all.