Adding Music

I have some instrumentals that are in wav format that I wanted to
include in one of the shows that I am trying to do. when I click add
files and pick the songs out that I want then I get a notice that
the songs must be 3 seconds long but all of these are at least 2
minutes or more longer. Can anyone tell me what may be going on with
this problem at all This is hold up the whole process Tbanks
Sandy Davenport