Cant Add Scenes or Scene Window

Hi,

I cannot add scenes to my flash animation. When I go to Insert>Scene, the scene button is not selectable. When I go to Windows>Scene, the scene window is not selectable. I have also troed using the keyboard shortcuts, which have not worked either. What can I do about this? I would like to add scenes, as I am working on rather large and confusing projects.

Any help is appreciated.

Thanks.