Exactly what is says on the tin, i have a water body in this project i am working, i loaded the project up, the water texture was gone, it had this red x on the water droplet. I dragged in a different water body the texture for the first one game back but the red x remained.
An “X” on a waterbody could be used as a navigation marker. For example, it might mark a spot that should be avoided or a point of interest for boaters or navigators. In navigational charts or maps, various symbols and markings are used to indicate safe passages, hazards, or reference points. 
I have the same error on my water body, it will still deform the landscape but the water itself has dissapeared?
