Warning: mysqli_query() expects parameter 1 to be mysqli, null given in D:\OSPanel\domains\localhost\proverki.php on line 120 Connection error1

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            <a href="admin.php" type="button"><-----Вернуться назад </a>

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                    <td></td>
                    <td></td>
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                </tr>
                <tr>
                    <td>
                        <input type="text" name="checking" form="checking-form">
                    </td>
                    <td>
                        <button form="checking-form" type="submit">Введите дату</button>
                    </td>
                </tr>
                 <td>День сдачи</td>
                    <td>Читатель</td>
                    <td>Книга</td>
                <?

                        include("dbinsert.php");
                        $checking = $_POST["checking"];


                        $result = null;

                        if ($checking) {
                            $query = "SELECT `Date_vozvrata`,`ID_Zakazchika`,`Name_Book` from `zakaz` WHERE (Date_vozvrata <= '$checking')";
                            $result = mysqli_query($link, $query) or die("Connection error1");  
                        }

                        if ($result) {
                            while ($row = mysqli_fetch_assoc($result)) 
                            {
                                ?>


                <tr>



                                    <td><? print $row['Date_vozvrata']?></td>
                                    <td><? print $row['ID_Zakazchika']?></td>
                                    <td><? print $row['Name_Book']?></td> 
                                <?
                            }
                        }


                        mysqli_close($link);

                    ?>
                </tr>


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