Validation error in head section

Hi,

I’m using AMP 0.3.2. together with Glue for Yoast SEO & AMP 0.3.2.

I’m getting the following error messages in the validator:

The mandatory text (CDATA) inside tag ‘head > style : boilerplate’ is missing or incorrect. (see https://www.ampproject.org/docs/reference/spec.html#required-markup)

The mandatory text (CDATA) inside tag ‘noscript > style : boilerplate’ is missing or incorrect. (see https://www.ampproject.org/docs/reference/spec.html#required-markup)

The failing code looks like this:

<script src="https://cdn.ampproject.org/v0.js" async></script>
<style amp-boilerplate>body {
-webkit-animation:0 8s steps(1,end) 0 1 normal both;
-moz-animation:0 8s steps(1,end) 0 1 normal both;
-ms-animation:0 8s steps(1,end) 0 1 normal both;
animation:0 8s steps(1,end) 0 1 normal both;
}

to {
visibility:visible;
}</style>
<noscript><style amp-boilerplate>body {
-webkit-animation:none;
-moz-animation:none;
-ms-animation:none;
animation:none;
}</style></noscript>

Can this be caused by an installed plugin or is it another problem? Thanks for any help!

https://ww.wp.xz.cn/plugins/amp/