to match files !! HELP!!

This is the first time this has happened. When I try to save a sequence It tells me (to match files!!) and will not save the sequence? I hav'nt found anything in the manual or elsewhere that explains this. HELP any one PLEASE!

im not sure exactly what the problem is but this is how i save my files ..

1) create new folder
2) save all programs and samples
3) save all seq and songs

If your not sure, then go to the load window and hit the window key and make sure that your new folder you created has the program file and the all seq and songs file along with the samples from that beat.

This is on the 2000xl btw, not sure but i think the 2000 is pretty much the same.