I worked on my project for days, and all of a sudden that happened. Its like when i move an obeject, the rendertextrue does not updating. What can i do? Please send help! 
,When objects move this happens:
Please someone help, i worked in this project for days, and all of a sudden that happened
What you’re seeing is the Hall of Mirrors effect/rendering artifact, which is caused when the buffers aren’t being cleared for a new rendering frame. Impressively, it’s actually fairly hard to find very clear and concise examples of this online with examples.
In other words, you probably need to change the Camera's Clear Flags, to something like a “Solid Color” with 0 alpha.