Unable to load graph manager: The given key '...' was not present in the dictionary

Under certain circumstances Identity Panel administrators may see an error when reloading the Identity Graph in the Web output module on the dashboard. 

Unable to load graph manager: The given key 'ceedc7e1-f471-4bf0-a73f-4048c741b242' was not present in the dictionary. 
at System.Collections.Generic.Dictionary`2.get_Item(TKey key) 
at SoftwareIDM.AccessPanel.Helpers.ProjectedUtil.ReloadManager(IDataEngine startDb, GraphManager manager) 
in C:\SoftwareIDM\IdentityPanel\src\Providers\SoftwareIDM.AccessPanel\Helpers\ProjectedUtil.cs

This is caused by an attempt to load data from a Silo that isn't found and may be the result of;

• configuration variations between environments, e.g. settings migrated but providers created separately
• removal of a Silo

The Silo reference is typically in a Projected Silo configuration, updating with a correct reference or removing it should resolve the error. 

To identify the Silo from the GUID, one can use the ReverseSpecial() function in the Rule Tester, no Data Type or Query Filter needs to be specified;

ReverseSpecial("ceedc7e1-f471-4bf0-a73f-4048c741b242", "Identity Silo")