site php returns [closed]

My page is returning > minor signal when add the following code that is commented:

<form name="form_import" id="form_import" method="post" action="<?php echo $_endereco ?>" enctype="multipart/form-data">
  <table class="formulario">
    <tbody>
      <tr class="cabecalho">
        <th colspan="2">
          Agraves - importar
        </th>
      </tr>
      <tr>
        <th>
          <label>Tipos de Agreve</label>
        </th>
      </tr>
      <tr>  <th></th>
        <td>
          <a href="upload_foto/agrave_pdf.php">
            <ul>
              <li>Agrave 4 salarios</li>
              <li>agrave 10 salarios</li>
            </ul>
          </a>
        </td>
      </tr>
      <tr>
        <th>
          <label>Arquivo </label>
        </th>
        <td>
          <input type="file" name="arquivo" id="nome_arquivo"/>
        </td>
      </tr>
      <tr class="rodape">
        <td colspan="2">
          <input type="hidden" name="advogado" id="acao" value="<?php echo $_SERVER['PHP_SELF']."?login=$_SESSION['_codigo_usuario']"; ?>">
          <button type="submit" src="mgm/importa.png" alt="Importar" class="elemento_a_direita"/>Importar
        </td>
      </tr>
    </tbody>
  </table>
</form>