Preview failed in CC 2018

Hi there:

I have imported a movie, which can be previewed in the footage, but it can't be previewed normally in the composition window. Pressing the blank key or the 0 key will not move.

But the old projects I created with AE CS6 are also useful for these videos. These projects can still work in CC 2018. But if I use these videos in a new project opened with CC2018, the above situation will happen.

Anyone could help me?

↓Open a new project and built a new comp.

↓ Import a .mp4 movie, It can be preview in the footage window, space and 0 button feature is normally.

↓But in compositon window, preview is fail, space and 0 button cant run.

↓Even press and drag the time bar......