Specialist pathway

I have encountered a problem with my model, half of it has disappeared. I'm not exactly sure why and i have looked it up online to try ans solve the problem, scanning through forums to see if anybody has had this problem but i was not able to find anything that would help. I have had to go back to a previous save, this save has the model complete but there are no textures on the model i will have to re-texture it.

This is the error message that occurred when i opened my file, it comes up every time i try to open the file and after i close the error message i cannot see anything in my perspective view port. This will put me back a few hours and i have concerns about not having enough time for rendering and animation.  

So i will go back to a previous file and i will have to re-texture it. This should take me an hour maybe 2 and then i will add water to the scene and then go on to do the lighting and rendering.