3321073 - Error "Could not load file or assembly 'pluginwrapper, Version=1.3.3.0, Culture=neutral, PublicKeyToken=8ede04ace7fbcb32' or one of its dependencies"

An exception occurs when Analysis for Office tries to connect to the backend system.

In the traces of AO that can be recorded by following the instructions of SAP Note 2129389, the folowing entries can be found:
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Caught exception while initializing RFC parameters: System.IO.FileNotFoundException: Could not load file or assembly 'pluginwrapper, Version=1.3.3.0, Culture=neutral, PublicKeyToken=8ede04ace7fbcb32' or one of its dependencies. The system cannot find the file specified.
File name: 'pluginwrapper, Version=1.3.3.0, Culture=neutral, PublicKeyToken=8ede04ace7fbcb32'
at Com.Sap.Cof.ConnectionService.BusinessWarehouse.BwConnectionManager.InitializeClientPassportHandler()
at Com.Sap.Cof.ConnectionService.BusinessWarehouse.BwConnection.InitNcoParameters(IAuthentication authentication)
...
Exception while connecting to BW with user XYZ: Com.Sap.Cof.Interfaces.Connection.ConnectionException: Could not load file or assembly 'pluginwrapper, Version=1.3.3.0, Culture=neutral, PublicKeyToken=8ede04ace7fbcb32' or one of its dependencies. The system cannot find the file specified. ---> System.IO.FileNotFoundException: Could not load file or assembly 'pluginwrapper, Version=1.3.3.0, Culture=neutral, PublicKeyToken=8ede04ace7fbcb32' or one of its dependencies. The system cannot find the file specified.
...
General .NET Exception [3329-c78f-d1]:
Could not load file or assembly 'pluginwrapper, Version=1.3.3.0, Culture=neutral, PublicKeyToken=8ede04ace7fbcb32' or one of its dependencies. The system cannot find the file specified.
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SAP Analysis for Microsoft Office

3329-c78f-d1, pluginwrapper, 8ede04ace7fbcb32 , KBA , BI-RA-AO-XLA , Excel Addin , Problem