FactoryException: Class does not exist: NetOffice.OfficeApi.

[jozefizso]

NetOffice library may report invalid class name in the FactoryException thrown from CreateObjectFromComProxy() method.

The Class does not exist: NetOffice.OfficeApi. should end with the class name of the component for which the instance could not be created and the classType is null.

NetOffice/Source/NetOffice/Core.cs

Line 1231 in f2e3dcd

throw new FactoryException("Class does not exist: " + (true == String.IsNullOrWhiteSpace(fullClassName) ? ComTypes.TypeDescriptor.GetFullComponentClassName(comProxy) : fullClassName));

Invalid class name is created in the GetFullComponentClassName() method:

NetOffice/Source/NetOffice/ComTypes/TypeDescriptor.cs

Line 45 in f2e3dcd

public static string GetFullComponentClassName(object component)

[jozefizso]

Stack trace:

NetOffice.Exceptions.FactoryException: Class does not exist: NetOffice.OfficeApi.
  Module "NetOffice.Core", in CreateObjectFromComProxy
  Module "NetOffice.Core", in CreateObjectFromComProxy
  Module "NetOffice.Utils", in GetProxyEnumeratorAsProperty
  Module "NetOffice.OfficeApi.DocumentProperties", in GetEnumerator
  Module "System.Linq.Enumerable", in First

[Offbeatmammal]

intermittently seeing the same issue, curious if there are any suggested workarounds or planned fix?

NetOffice.Exceptions.FactoryException
  HResult=0x80131500
  Message=Class does not exist: NetOffice.PowerPointApi.
  Source=NetOffice
  StackTrace:
   at NetOffice.Core.CreateObjectFromComProxy(IFactoryInfo factoryInfo, ICOMObject caller, Object comProxy, Type 
comProxyType, String className, String fullClassName, Boolean allowDynamicObject)
   at NetOffice.Core.CreateObjectFromComProxy(ICOMObject caller, Object comProxy, Boolean allowDynamicObject)
   at NetOffice.Utils.<GetProxyEnumeratorAsProperty>d__13.MoveNext()
   at NetOffice.PowerPointApi.Shapes.<GetEnumerator>d__121.MoveNext()

[IainDM]

Also seeing this intermittently. StackTrace below from an enumeration over a sheet's CustomProperties

NetOffice.Exceptions.FactoryException: Class does not exist: NetOffice.ExcelApi.
at NetOffice.Core.CreateObjectFromComProxy(NetOffice.IFactoryInfo factoryInfo, NetOffice.ICOMObject caller, System.Object comProxy, System.Type comProxyType, System.String className, System.String fullClassName, System.Boolean allowDynamicObject) at offset 348
at NetOffice.Core.CreateObjectFromComProxy(NetOffice.ICOMObject caller, System.Object comProxy, System.Boolean allowDynamicObject) at offset 227
at NetOffice.Utils.d__13.MoveNext() at offset 353
at NetOffice.ExcelApi.CustomProperties.d__26.MoveNext() at offset 101