Please test your application with the attached library (I assume this error happens on the desktop).
Also ass 'Msgbox(FMod.DLLVersion)' and make sure it shows 1.51.
An other question about Fmod.Play2("My file.mp3", Mod as int 16)
I had look at the docs at FMOD and I didn't understand at all. What are the Mod I must write?