Problems with Materials

There was a big problem which occurred with the materials which meant that every time I rendered, anything that appeared with a material assigned to it, appeared black. This was a big problem because I could not render with things appearing black.

I found out that the problem occurred because the default material was set to 'arch and design' which was apparently not compatible with the file. To solve this solution I set each of the materials a parent files to 'Standard'.

The image below shows how I did this.