Onde tá o erro?

<div id="login" class="grid_4">

<form method='POST' action='cadastros.php'>

                    <?php

                    echo "<br><br><p id=ca style='color: white' align=center>";
                    echo "Seja bem vindo :<br> ". $_SESSION[$login] -> nome . "<br><br>";
                    echo "E-Mail: <br>" . $_SESSION[$login] -> email."</p>";

                    ?>

                        <a id=li href="http://localhost/avaliacao2/HTML/editar.php"><h3>EDITAR CONT</h3></a>
</form>

<br>
<center><img src="./img/login.png" width="140" height="40" alt="login"></center><br>
<form name="login" action="index.php">
     &nbsp;&nbsp;<img src="./img/usuario.png" border="0" width="40" height="30" align="top" alt="usuario">
    <input type="text" name="nome" size="11"><br>

     &nbsp;&nbsp;<img src="./img/senha.png" border="0" width="40" height="30" align="top" alt="senha">
    <input type="password" name="senha" size="11"><br><br>

  <center><input type="submit" value="login"></center>
</form>
<p class="login">&nbsp;&nbsp;&nbsp; <a href="HTML/cadastro.html" class="login"> &#8658; Registre-se</a><br>

</p></div>