Pages gives an error, 'Cannot read file' , when trying to open pages document

I recently deleted a pages file. I recovered it using disk drill and now Pages refuses to open it. It gives me an error that it cant read the file. The file size is exactly the same as i had created earlier. Please help me out on this. This is a very important essay and i spent weeks tyiping it. The file size is about 10.6 mb with all graphics and images. Please help me out