This does not work, thanks for the response though.
I have done everything you said, still no sound when playing the song back
the instrument is Shreddage 3 Jupiter, and it's the only instrument loaded in Kontakt (though any other Kontakt instrument will also produce the same effect). It is also the only Kontakt instrument in the Synth Rack.
I would also like to say it's not project specific, any midi file loaded into any project, or any midi file that is opened, if I put one of the midi tracks into a Kontakt instrument, will produce no sound coming through said Kontakt instrument when playing the song back. Even if it's the only instrument in the Synth Rack. However, if I manually place the notes, it will play the notes I placed, but will not play the notes from the midi file. However, if i click on a note that was made from the midi file, no sound will play from Kontakt when playing back, but the notes I previously placed before clicking on a midi note will play and produce a sound, so I don't think it's a volume issue.