invalid song?

Hi I have just received my beat buddy and in the pc software I have created my first song. I didn’t want an intro or outro and selected only one fill for each track 1 and 2 verse and chorus. when I try to synchronise the project it is telling me that at least one song does not have a main drum loop? I have sampled each one and it seems fine, what have I done wrong?

Found it, I had made a new song file by mistake. deleted it and all fine now