Error listing tables in Object Explorer: "System.Xml.Schema.XmlSchemaException" (4275774)

The following error occurs when attempting to list tables in Object Explorer. Tables are not listed.

System.Xml.Schema.XmlSchemaException: The 'http://www.quest.com/2010/15/04/Quest.PersistentCache:CustomDateRange' element is not declared.

Stack trace:

at System.Xml.Schema.XmlSchemaSet.InternalValidationCallback(Object sender, ValidationEventArgs e)
at System.Xml.Schema.BaseProcessor.SendValidationEvent(XmlSchemaException e, XmlSeverityType severity)
at System.Xml.Schema.BaseProcessor.SendValidationEvent(XmlSchemaException e)
at System.Xml.Schema.Compiler.CompileElement(XmlSchemaElement xe)
at System.Xml.Schema.Compiler.CompileParticleElements(XmlSchemaComplexType complexType, XmlSchemaParticle particle)
at System.Xml.Schema.Compiler.CompileParticleElements(XmlSchemaComplexType complexType, XmlSchemaParticle