Facil un my program

Good morning to everybody. I have a problem, every time I try to open a work this message appears and I don't know why.
I have to send this work by the 29th and I still need to put the letter :( please if someone can help me or tell me how to do so that this file can be opened I appreciate them. Resources and it usually turns off due to a battery error ( which happened when I was composing the work) but I had already saved it before so I do not worry, but today in the morning I tried to open the file (ctrl + o) as I have always done and without changing places this appeared.
I've been trying to do something for hours, and nothing useful appears on the internet, please help me.