If you have enabled the CLD Cache, you might need to clear the cache from time to time. The CLD cache can get out of sync (stale) with your system configuration for various reasons.
The following are a few reasons the CLD cache might become stale.
You add, delete or rename a server.
You move a server from one function to another in your configuration.
You move one or more calendars to different back-end servers.
If any of these things happen, in order to refresh the CLD cache, you must clear it.