Uncaught TypeError: Object [object Object] has no method 'DataTable'

I included both the css and the js file but there's no documentation how to install the DataTable() method on the table.
I verified that the js file is running and I copied the table from the examples so I have everything: the "table" and everything required inside it. I only need to find out how to install DataTable so the "DataTable" method will be exist on my table.