Fusion error message?

Can anyone tell me why this happens as soon as I try to add a movie clip to fusion?

(the file exists.. just dragged it onto the fusion page)

Loader1 failed to load file "G:\Projects\Footage\Signicat\portraits\antti-h.mp4" (clip "G:\Projects\Footage\Signicat\portraits\antti-h.mp4" at frame 0)
PreviewSaver1 cannot get Parameter for Input at time 0
PreviewSaver1 failed at time 0
Loader1 failed to load file "G:\Projects\Footage\Signicat\portraits\antti-h.mp4" (clip "G:\Projects\Footage\Signicat\portraits\antti-h.mp4" at frame 1)
PreviewSaver1 cannot get Parameter for Input at time 1
PreviewSaver1 failed at time 1
ERROR: Render failed at Fri 12:03PM! Last frame rendered: (none)!
Loader1 failed to load file "G:\Projects\Footage\Signicat\portraits\antti-h.mp4" (clip "G:\Projects\Footage\Signicat\portraits\antti-h.mp4" at frame 94) : No such file or directory
Loader1 failed at time 94

What kind of an mp4 is it? Some of them are difficult for Fusion to play back since they don't actually contain seperate frames. So reconstructing them from different points in the file is not an easy task for Fusion which was designed to work with seperate images.

Yes precisely.

However when I do exactly the same thing in the Fusion page in DR with the same clip it works ok?