Kontakt & Sibelius V3 Error :4

I have followed all the instructions on how to use Kontakt and Sibelius using the Midi Maple program but everytime I go to setup my MIDI devices in Sibelius 3 i get an "Error: 4, The specified device is already in use. Wait until it is free, then try again" message??? Anyone know what I am doing wrong or how to fix this?
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