Failed to import file using after effects cs4

Hello,
I am trying to import file “DJ.mov” using after effects cs4 but it gives the following error message saying “After Effects error: File “DJ.mov” cannot be opened, it may be in an unsupported format”. Provide any resolution for this problem. I would be grateful to you.

After Effects error: File “DJ.mov” cannot be opened, it may be in an unsupported format.
(86::1)
