This template header makes a 403 error at saving

ℹ️ Support
1

I want to make a campaign template and this header makes a 403 when trying to save. Why?

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Convenci&oacute;n Argentina de Circo, Payasos y Espect&aacute;culos Callejeros</title>
<style type="text/css">
<!--
.textito {
color: #666;
font-family: Verdana;
line-height: 1.3em;
font-size: 8pt;
text-align: center;
}
.texto {
font-family: Verdana;
line-height: 1.3em;
font-size: 10pt;
color: #000;
text-align: left;
}
-->
</style>
</head>

With a previous version of PHPList, this head worked. Now, it doesn’t.
If I make a new template, and add some images and text (using default FCK editor), it saves it well.

2

I deleted the meta line and it worked. I don’t know why.