无法读取属性＆＃39; mData＆＃39;未定义？

Question

我正在尝试显示数据数据表，Tapo有问题，请帮助，对于另一个dicode datatables可以成功运行，但是在这段代码中不想要这条路吗？ 未捕获的TypeError：无法读取属性＆＃39; mData＆＃39;未定义的

这个JS

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 <script src="<?php echo base_url('assets/js/jquery.dataTables.min.js') ?>" type="text/javascript"></script>
    <script src="<?php echo base_url('assets/js/dataTables.bootstrap.min.js') ?>" type="text/javascript"></script>
    <script>
        $(document).ready(function() {
            $('#files').DataTable();
        });

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table class="table table-striped table-condensed" id="files">
                <thead>
                    <tr>
                        <th>File Name</th>
                        <th>Upload By</th>
                        <th>Upload Date</th>
                        <th></th>
                    </tr>
                </thead>
                <tbody>
                    <?php 
	                    foreach($files as $f => $file){
                            foreach($permission as $p => $key){
                                if($key['id_files'] == $file['file_id'] ||$this->user->is_teacher || $this->user->is_superadmin ){
                                echo '<tr>';
                                echo '<td><a href="'.base_url('dropzone/global_download')."/".$file['file_id'].'">'.$file['file_name'].'</a></td>';
                                echo '<td>'.$file['upload_by'].'</td>';
                                echo '<td>'.date("d-M-Y",strtotime($file['upload_dt'])).'</td>';
                                echo '<td>';
                                if($this->user->is_teacher || $this->user->is_superadmin){
                                echo '<a href="'.base_url('dashboard/permission_file')."/".$file['file_id'].'"><i class="fa fa-user"></i> Manage </a>';
                                echo '</td>';
                                echo '<td>';
                                    echo '<a href="javascript:_delete_file('.$file['file_id'].');"><i class="fa fa-times"></i> Delete </a>';
                                }
                                echo '</td>';
                                echo '</tr>';
	                           }
                            }
                        }
	                ?>
                </tbody>
            </table>

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