Why is this JQuery error happening? Animate is not a function

I am learning jQuery and trying to work my way around a scroll effect. Anyway, I am trying to make this code work but having trouble in doing so. It breaks when It runs the animate function:

I would really appreciate your help on this one. Thank you.

Uncaught TypeError: $(…).animate is not a function
at HTMLAnchorElement. (script.js:58)
at HTMLDocument.dispatch (jquery-3.1.1.slim.min.js:3)
at HTMLDocument.q.handle (jquery-3.1.1.slim.min.js:3)

// Select anchor tags to click on 
$(document).on("click", "a", function(event) {
  console.log("item clicked");

  // Clear out the default action  
  event.preventDefault();
  console.log("working until now");

  // Animate to selected selected target
  $("html,body").animate({
    scroll: $($(this).attr('href')).offset().top
  }, 900);
  console.log("no errors for now");
});
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
<script src="javascript/script.js">
</script>

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