Unable to install the hotfix KB2687238

Hi,

I am unable to install the hotfix KB2687238 for "cannot import fields that are arrays from a table in Microsoft Office Excel with the Microsoft Dynamics AX 2012 Office Add-ins installed"

Below given is the error I get in the setup log:

Getting known model databases from AOS configuration.
Calling AxUtil to get list of installed models.
Using AxUtil to connect to database "MicrosoftDynamicsAX" on server "xxxxxx".
Exception: System.ArgumentNullException

 Message: Value cannot be null.
Parameter name: collection

 FullText: System.ArgumentNullException: Value cannot be null.
Parameter name: collection
   at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at Microsoft.Dynamics.Setup.DatabaseSqlModel.DatabaseSqlModelInstanceCommon.GetInstalledModels()
   at Microsoft.Dynamics.Setup.DatabaseSqlModel.DatabaseSqlModelInstanceUpdate.GetApplicableModels()
   at Microsoft.Dynamics.Setup.DatabaseSqlModel.DatabaseSqlModelInstanceUpdate.IsUpgradeable()
   at Microsoft.Dynamics.Setup.DatabaseSqlModel.AddInstancesFromAOSConfig()
   at Microsoft.Dynamics.Setup.Driver.MainPart2(String[] args)
   at Microsoft.Dynamics.Setup.Driver.Main(String[] args)

 ==== Setup encountered an unhandled exception and could not be completed. For details see the previous messages in the log. ===

What procedure needs to be followed or which step am I missing?