Error after importing connections from DB2 Connect: "System.Reflection.ReflectionTypeLoadExceptio (4317416)

After importing  all connections from  DB2 Connection, the following error occurs.   Issue persists even after deleting all connections and configuring them manually.

System.Reflection.ReflectionTypeLoadException
Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
Stack Trace:
    at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
    at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
    at System.Windows.Forms.Control.Invoke(Delegate method)
    at Quest.Toad.Util.Facility.Load()
    at Quest.Toad.Util.Facility.get_ImplementationType()
    at Quest.Toad.DB2.DB2Provider.CreateProviderConnection(ConnectMediator mediator)
    at Quest.Toad.Db.Provider.BackgroundConnector.CreateBackgroundConnection()