I had worked for days to finish a grade 7 unit on Ecosystem interactions, then I got  that horrible message when trying to open it up " word cannot open the file" z error "087" line 2 null.  "

I almost cried.  School starts in two weeks and my whole first unit - gone.  

What is even more frustrating is that ever since I got Word 2013 this has happened to four of my units- and only when they are almost done.