TypeError: $(...).owlCarousel is not a function

You will get this error if the jquery file is loading after the owl carousel file.

(Make sure your reference to jquery is above the owl carousel reference js file)

Add owl.carousel.min.js file in your home page and before the file in which you are using add the following code:

$("#owl-demo").owlCarousel({
    navigation : true
  });

Then only it will work.