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Updated August 3, 2016
This article addresses a scenario where the Pull-Down lists in all alert conditions are empty.
All Orion modules
This occurs when there is a problem with a SWIS entity.
Error in OrionWeb.log
Error when calling action on url: http://solarwinds/api/ExpressionBuilderData/GetGroups.
System.NullreferenceException: Object reference not set to an instance of an object.