Problem with homepage slider

First I want to thank for this great theme! My website is

I have a problem with the slider on the homepage. The only thing what the slider shows are 2 dots (of the 2 uploaded images). Do you know how I can fix this problem?

You don’t have Featured images set for those Posts/Pages. You might have images inside posts but that is not the right way because you need Featured Images. Here you can read more how to use them:

Thank you, that fixed it!