Logic express "Instrument EXS24 Yamaha Grand Piano.exs: 054_F#2KM56_S.wav file audio couldn't be found"

Hi, i have a problem with logic express opening on the macbook pro, i have the program on the imac and it works good, but when i put it on the macbook pro and open it i want to select the acoustic piano instrument and it says: "Instrument EXS24 Yamaha Grand Piano.exs: 054_F#2KM56_S.wav file audio couldn't be found", and i cant use the piano controller to record acoustics pianos, please if someone know what is happening and how to fix it,

Thx!