1 exception(s): Exception #0 (Magento\Framework\Config\Dom\ValidationException): Element 'css': This element is not expected. Line: 542 facing this issue in 2.2.5.
I have upgraded from Magento 2.1.9 to Magento 2.2.5 version.
Please help me guys.
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The error is showing because there is layout file which has a node. you should check your custom theme's Magento_Theme/layout/default.xml file if you have any css node, ( also check your default_heads_block.xml file if you have added any custom css file ) if you don't fine any then check layout of specific page where this error is showing.
if you are using linux / ssh ( run this command it would find and list the file where this is added / declared )
grep -r -i --include \*.xml '<css' app/design/frontend/