javascript function didn’t refresh my php code

I want to refresh my div with PHP code in div tag but it’s don’t work. console said:

Uncaught TypeError: $(…).load is not a function

at doRefresh

<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"> </script>
 
</head>
<body>
<div id="actu">
    <?php include 'process.php'; ?>
</div>
 
<script type="text/javascript">
   $(document).ready(function() {
        function doRefresh(){
           $("#actu").load("process.php");
        }
        $(function() {
            setInterval(doRefresh, 2000);
        });
    });

</script>
</body>
</html>

EDIT

OP has updated code based on answer and comments.

Answer

Include your code in a document ready handler to ensure the script will run once the page loads:

<script type="text/javascript">
   $( document ).ready(function() {
        function doRefresh(){
           $("#actu").load("process.php");
        }

        setInterval(doRefresh, 5000);

    });
</script>

In addition, remove one of the jQuery library requests as this may cause problems. You also have an extra </script> tag which should be removed.

You do not need the second document handler, but it should not hurt anything. I have removed iy here.

EDIT

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Answer