You need to setup your homepage first!

1. Go to Admin -> Plugins then activate all plugins.

2. Go to Admin -> Pages and create a page:

- Content:
[simple-slider key="home-slider"][/simple-slider]
[category-posts][/category-posts]
[all-galleries][/all-galleries]

- Template: Homepage.

3. Then go to Admin -> Appearance -> Theme options -> Page to set your homepage.