tried to export hand-drawn frames as gif but it shows up blank.

I hand-drew 18 frames of an alligator and imported them in to cc animate. the clip would play no problem when I hit the play button. But nothing would show up when I click on test movie. Everything would show up as blank when I tried to export the clip either as gif or otherwise. 

Everything i tried would come up as blank not even the original image of my gator. Any help would be greatly appreciated. Thank you.