如何避免未捕获的jQuery错误

I am using Owl Carousel in my WordPress theme and currently applying jQuery inside my page while chances are that there may not be jQuery loaded until I am calling that function and it throws that error ... how to avoid that error ? I am using document . ready function as well ..... while I want to load jQuery in my footer only not in header as well ... any one to guide me please where am I wrong ? here is the code i am using I am using Owl Carousel in my WordPress theme a