I'm currently writing my thesis and found a template which worked great at the start. Using the styles I am able to use Heading 1, Heading 2 and so on and as I start a new chapter the numbers increment. Heading 2 for example inserts 1.1, if I insert Heading 2 again it inserts 1.2 and so on. The only problem I'm having is with Heading 1. I want it to insert Chapter 1, Chapter 2 etc etc but at the moment it just inserts a black rectangle
If I enter text I get the following
.
I've looked at the style for H1 but I cant see what I need to change

Any help would be greatly appreciated