Post Grid owlCarousel Console Error & Search Broken

I am getting the following JS error on the home page of my website, which is the only location on the website I am using Post Grid. And it is causing both the native search & plugin search to not function.
(index):384 Uncaught TypeError: $(...).owlCarousel is not a function
at HTMLDocument.<anonymous> ((index):384)
at n (jquery.min.js:2)
at Object.fireWith (jquery.min.js:2)
at Function.ready (jquery.min.js:2)
at HTMLDocument.B (jquery.min.js:2)
(anonymous) @ (index):384
n @ jquery.min.js:2
fireWith @ jquery.min.js:2
ready @ jquery.min.js:2
B @ jquery.min.js:2