The exceptions thrown when a central model can be reached but access is denied due to a lack of access privileges. 
   Namespace:   Autodesk.Revit.Exceptions  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Inheritance Hierarchy
  System Object  
System Exception
Autodesk.Revit.Exceptions ApplicationException
Autodesk.Revit.Exceptions CentralModelException
Autodesk.Revit.Exceptions CentralModelAccessDeniedException
 
 System Exception
Autodesk.Revit.Exceptions ApplicationException
Autodesk.Revit.Exceptions CentralModelException
Autodesk.Revit.Exceptions CentralModelAccessDeniedException