Add video Track is greyed out

Hello everyone,

When I load a default project, all video´s can be imported via all various ways.
But when I load up an old Cubases 5.5 project, there´s no way to import that video or any other for that matter.
So I can´t import a video (only the audio is imported) drag a video into the project and the “add video track” is greyed out.
Can anyone help please?