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Known Issues

Old libxml library

A lot of shared hostings are using archaic version of libxml library that does not support amp-compatible html markup. When you are seeing the following error:

AMP validation had errors:
The mandatory tag 'noscript enclosure for boilerplate' is missing or incorrect.

That means that DOMDocument parser can’t place <noscript> tag properly according to AMP requirements.

There are two ways of solving this issue:

  • Contact your hosting and request a libxml library upgrade (2.8.0 or newer is required)
  • Disable third-party Magento module that uses DOMDocument parser

Broken AMP pages on Magento 2.1.x

Magento 2.1.x missing event we use in AMP to transform normal tags to amphtml.

Pull request with this event was accepted Pull Request 3779 but not added in Magento 2.1.x.

Open lib/internal/Magento/Framework/View/Element/AbstractBlock.php and apply following changes in toHtml method:

--- a/lib/internal/Magento/Framework/View/Element/AbstractBlock.php
+++ b/lib/internal/Magento/Framework/View/Element/AbstractBlock.php
@@ -665,6 +665,18 @@ abstract class AbstractBlock extends \Magento\Framework\DataObject implements Bl
         $html = $this->_afterToHtml($html);

+        /** @var \Magento\Framework\DataObject */
+        $transportObject = new \Magento\Framework\DataObject(
+            [
+                'html' => $html,
+            ]
+        );
+        $this->_eventManager->dispatch('view_block_abstract_to_html_after', [
+            'block' => $this,
+            'transport' => $transportObject
+        ]);
+        $html = $transportObject->getHtml();
         return $html;

The attribute ‘template’ is not allowed error on Magento 2.1.x

In Magento 2.1.x you can see a lot of error messages in system.log:

Element 'referenceBlock', attribute 'template': The attribute 'template' is not allowed.

Pull request with fix was accepted Pull Request 9772 but not added in Magento 2.1.x.

Open lib/internal/Magento/Framework/View/Layout/etc/elements.xsd and allow template for blockReferenceType:

--- a/lib/internal/Magento/Framework/View/Layout/etc/elements.xsd
+++ b/lib/internal/Magento/Framework/View/Layout/etc/elements.xsd
@@ -314,6 +314,7 @@
             <xs:element ref="uiComponent" minOccurs="0" />
         <xs:attribute type="elementNameType" name="name" use="required"/>
+        <xs:attribute type="xs:string" name="template" use="optional"/>
         <xs:attribute type="xs:boolean" name="display" default="true" use="optional"/>
         <xs:attribute type="xs:boolean" name="remove" use="optional"/>

Amasty SeoToolKit wrong pagination urls

Open Amasty\SeoToolKit\Plugin\Pager and find removeFirstPageParam method:

private function removeFirstPageParam(&$url)
    /* check if url not ?p=10*/
    if (strpos($url, 'p=1&') !== false
        || strlen($url) - stripos($url, 'p=1')  === strlen('p=1')//in the end of line
    ) {
        $url = $this->urlHelper->removeRequestParam($url, 'p');

replace with:

private function removeFirstPageParam(&$url)
    /* check if url not ?p=10*/
    if (strpos($url, 'amp=1') === false &&
        (strpos($url, 'p=1&') !== false
        || strlen($url) - stripos($url, 'p=1')  === strlen('p=1'))//in the end of line
    ) {
        $url = $this->urlHelper->removeRequestParam($url, 'p');
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