How to pull an mp4 video file from internal storage into the video player

It seems when I connect AI to my android tablet the video player works as it should but when I actually build the app and put it on the same tablet I get error 701. Here is a screenshot of the code used. What can I do to make this work? Note there is no SD card in the device. It is purely running on internal storage and the files I need are located within the Download folder.

-- 

try a correct relative path, which is in your case

/Download/3d.mp4       

-- 

I changed the file path to /Download/3d.mp4 and it's still coming up with error 701.Am I missing something?

-- 

then I would try the full path, which is

  file:///mnt/sdcard/Download/3d.mp4

--