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For understanding more about magento block types following are some built-in block types which are widely used in layout. core/template : This block renders a template defined by its  template  attribute. The majority of blocks defined in the layout are of type or subtype of  core/template . page/html : This is a subtype of  core/template  and defines the root block. All other blocks are child blocks of this block. page/html_head : Defines the HTML head section of the page which contains elements for including JavaScript, CSS etc. page/html_header : Defines the header part of the page which contains the site logo, top links, etc. page/template_links : This block is used to create a list of links. Links visible in the footer and header area use this block type. core/text_list : Some blocks like  content ,  left ,  right  etc. are of type  core/text_list . When these blocks are rendered, all their child blocks are rendered automatically without the need to call the getChildHtml

PHP Version Check Your PHP version is . The required PHP version is .  Download and install PHP from  www.php.net  using this  PHP Documentation . For additional assistance, contact your hosting provider. PHP Settings Check * Your PHP settings are correct. Cannot determine required PHP extensions: Warning: is_dir(): open_basedir restriction in effect. File(/etc/pki/tls/certs) is not within the allowed path(s): /tmp:/var/tmp:/usr/local/lib/php/ :/usr/local/php56/lib/php/) in /public_html/ve ndor/composer/composer/src/Composer/Util/RemoteFil esystem.php on line 914 It was SSL reason. In Magento 2.1.0 in default uses ssl. I'm not using ssl and the error arises. I just edit the config section of composer.json file in the root of magento and added the following line and every thing is OK. "disable-tls" : true