While i export the song to mastering page i have error message " missing file". And i even checked in the song that any file is missing. this problem comes when i recently updtaed my S1 V2 to V2.6.5. I also have S1 V4 pro. Another question, if i immigrate the song building inV2 to V4, will i meet the same problem ? anyway I'd like to end my song on V2.6.5 if it is possible ..