Error: Certificate processing encountered an unexpected error. Error: Unable to cast object of type

Symptom:

Certificate processing throws following error:

Certificate processing encountered an unexpected error.  Error: Unable to cast object of type 'Venafi.Drivers.Applications.X509Certificate' to type 'Venafi.Interfaces.Certificates.IX509ApplicationDriver'.

Cause:

This issue may be caused by incorrectly formatted “Base Path” entry in the registry. This entry exists under HKEY_LOCAL_MACHINE\SOFTWARE\Venafi\Platform.  We have seen the following incorrect entry (notice double backslashes):

C:\\Program Files\\Venafi\\

Resolution:

The value of this the “Base Path” entry should be similar to the following entry (depending on installation location):

C:\Program Files\Venafi\