Error: Cannot create FMOD::Sound instance for resource , (File not found. ) UnityEditor.DockArea:OnGUI()"

Hi all!Unity sounds are stored in the prefab,unity 4, everything was fine,but in Unity 5 this error:“Error: Cannot create FMOD::Sound instance for resource , (File not found. )
UnityEditor.DockArea:OnGUI()”

I Have met this same problem .