SuperSU on I9000 - Installation failed!

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http://forum.xda-developers.com – I have recently rooted my Samsung Galaxy S i9000 Gingerbread 2.3.6 XXJW4 and patched it with Semaphore 2.7.4. However I have run into a problem. When I start Super SU a message pops up telling me that the SU binary needs to be updated. I then hit continue and it takes a while to install until I get the dreaded message that Installation failed! :( How can I fix this? Please advise (HowTos)