Youtube Error Problem! "Upload Failed"?

I tried to post a video on youtube right when i clicked on the video to upload it says " Upload Failed: An unknown error occurred." so i tried it again it happened again. So i tried to upload a hypercam video (Which i posted before on youtube) but again it says " Upload Failed: An unknown error... show more I tried to post a video on youtube right when i clicked on the video to upload it says " Upload Failed: An unknown error occurred." so i tried it again it happened again. So i tried to upload a hypercam video (Which i posted before on youtube) but again it says " Upload Failed: An unknown error occurred." Why does that happen? Please Answer!!
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