Error in Cycles Rendering With Overlap Mesh

Hi, i wonder why the render is with this black overlay mesh? :confused:
Why is the black part in cycles render?

Screenshot:


Sorry for bad english.

Are you using a camera? Add a camera and render using the camera. If it continues showing I at least would need a blend file to know what is that.

I am using a camera.

= Edit =
Problem solved. The error was in the displacement map that affected the corners. :yes: