You might receive the above error message when you log on to the MetaFrame server after installing Service pack 3 for MetaFrame 1.8.
The ICA Pass-through client was not updated when installing MetaFrame 1.8 Service Pack 3.
Use Add/Remove Programs in Control Panel to manually update the ICA Pass-through client. Install the updated client in the %SystemRoot%system32ica passthrough directory on the server.
NOTE: Make sure you don't install the client to program filescitrix.