head> style [amp-boilerplate]

Notice: Uninitialized string offset: 0 in /home/escolaedti/public_html/wp-content/plugins/wordpress-seo/frontend/class-twitter.php on line 495

A tag “head > style[amp-boilerplate]” está ausente ou incorreta, mas é exigida pela “noscript > style[amp-boilerplate]”.

translation:

A “head> style [amp-boilerplate]” tag is missing or incorrect, but is required by “noscript> style [amp-boilerplate]”.

to fiz this I only delete the code line:

<br />
<b>Notice</b>: Uninitialized string offset: 0 in <b>/home/escolaedti/public_html/wp-content/plugins/wordpress-seo/frontend/class-twitter.php</b> on line <b>495</b><br />

line 10 of my code.

but I delete this code in the cache, so, when I enter on the url the code is automatic created.

How can I fix this? where is this message created ?

The page I need help with: [log in to see the link]