I added a mesh and made into a ceiling, in Blender. I applied some color to it, but when I render, the mesh is just black; the other objects are fine and have color. How do I fix this? I tried deleting it and inserting it again or copy-pasting the other objects but it still turns black.

[<img src="https://blend-exchange.giantcowfilms.com/embedImage.png?bid=356" />](https://blend-exchange.giantcowfilms.com/b/356/)

![The ceiling is black :(][1]


  [1]: https://i.sstatic.net/avk9c.png