Just to add a little bit of confusion.
the following line raise the above error:
Code:
<h2 id="heading_id_233" class="center">ANIMA CARA<br class="brs">(gennaio 1899)</h2>
the same line, but with two more break lines, does not raise any error:
Code:
<h2 id="heading_id_233" class="center">ANIMA CARA
<br class="brs">
(gennaio 1899)</h2>