Editing 2

I came back to my saved work the next day to find there was an error with our work and Adobe Premiere Pro said that i had to open a number of files to save my work, so i did so and once i finally got the work open i found that some of the work had been lost and this was a big set back to the editing as i had spent most of the lesson opening the lost work up and trying to retrieve it, so no work had been done and some of the work that was done the other day was lost so it needed to be recaptured again and this problem with adobe premiere pro happened with everyone in the class, which was effecting us to meet our deadline.