resolve ajax failure in codeigniter 3 view page?

PHP Code:

function toggleEdit(commentId) {
    
    console.log("Toggling edit for comment ID:", commentId);
    var commentText = document.getElementById('comment-' + commentId);
    var editTextarea = document.getElementById('edit-comment-' + commentId);
    var button = document.getElementById('edit-save-button-' + commentId);

    if (editTextarea.style.display === 'none') {
        // Switch to edit mode
        console.log("Switching to edit mode");
        commentText.style.display = 'none';
        editTextarea.style.display = 'block';
        button.textContent = 'Save';
    } else {
        // Save the edited comment
        console.log("Saving edited comment");
        var editedComment = editTextarea.value;
        console.log(" edited comment is:",editTextarea.value);
        console.log(" controller method:",'<?=$user_base_url?>/profil/save_comment');

        $.ajax({

            url: '<?=$user_base_url?>/profil/save_comment',//+ new Date().getTime(),
            type: 'POST',
            data: {
                id: commentId,
                comment: editedComment
            },
            success: function(response) {
                console.log("AJAX call successful");
                console.log(response);
                if (response.success) {
                    console.log("Comment saved successfully");
                    // Update the displayed comment and switch back to view mode
                    commentText.innerHTML = editedComment.replace(/\n/g, '<br>');
                    commentText.style.display = 'block';
                    editTextarea.style.display = 'none';
                    button.textContent = 'Edit';
                } else {
                    console.error("Error saving comment: ", response);
                    alert('Error saving comment.');
                }
            },
            error: function(xhr, status, error) {
                console.error("AJAX call failed:", status, error);
                alert('AJAX call failed.');
            }
        });
    }
}

Code:

$(document).ready(function(){

        var csrfName = $('.txt_csrfname').attr('name'); // CSRF Token name

        var csrfHash = $('.txt_csrfname').val(); // CSRF hash

...





$.ajax({

            url : "your-url",

            method: "POST",

            data : {name:name, age:age, [csrfName]: csrfHash},

            success:  ...