I opened a part file and it didn't display any features, what happened and how do I recover my part?

So I don't entirely understand wverything that happened. All I can say is that this morning I opened a part file that I had been working on yesterday this morning. When I opened it there was an error in the feature tree and all of my created features were missing. I have attached a snip of my window.  

SolidworksModeling And Assemblies