[SOLVED] USB Songs Problem

Hello,

I use Rekordbox 2.0.3 to upload my tracks. I have not had any problems until recently. When I plug in the USB to the CDJ 900 and select my tracks, some of them do not load. When it goes to load the track it says "Not Loaded." This happens to only some of the tracks, not all of them. I thought the problem might be my USB so I went and bought a new one, but the same thing happened. I have always uploaded my tracks on Rekordbox the same way so I have not changed anything in my work flow. I have tried different USBs and the same thing happens. The thing is also that on one USB a certain will not load, but when I plug in a different USB that same track works on the other USB. I do not know why this is happening and I would appreciate any help. I have one of the biggest gigs of my career coming up in 5 days and I would really like to use USBs and not CDs. Thanks!