Edit file File name : block.json Content :{ "$schema": "https://schemas.wp.org/trunk/block.json", "apiVersion": 3, "name": "core/missing", "title": "Unsupported", "category": "text", "description": "Your site doesn’t include support for this block.", "textdomain": "default", "attributes": { "originalName": { "type": "string" }, "originalUndelimitedContent": { "type": "string" }, "originalContent": { "type": "string", "source": "html" } }, "supports": { "className": false, "customClassName": false, "inserter": false, "html": false, "reusable": false } } Save