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Error: Unexpected Mobiledoc version "undefined"
    at validateVersion (/root/rankerxmobiledoc/node_modules/mobiledoc-dom-renderer/dist/commonjs/mobiledoc-dom-renderer/renderers/0-2.js:30:11)
    at new Renderer (/root/rankerxmobiledoc/node_modules/mobiledoc-dom-renderer/dist/commonjs/mobiledoc-dom-renderer/renderers/0-2.js:49:5)
    at RendererFactory.render (/root/rankerxmobiledoc/node_modules/mobiledoc-dom-renderer/dist/commonjs/mobiledoc-dom-renderer/renderer-factory.js:105:18)
    at MobiledocHtmlRenderer.render (/root/rankerxmobiledoc/node_modules/@tryghost/kg-mobiledoc-html-renderer/lib/mobiledoc-html-renderer.js:108:35)
    at /root/rankerxmobiledoc/index.js:67:43
    at Layer.handle [as handle_request] (/root/rankerxmobiledoc/node_modules/express/lib/router/layer.js:95:5)
    at next (/root/rankerxmobiledoc/node_modules/express/lib/router/route.js:144:13)
    at Route.dispatch (/root/rankerxmobiledoc/node_modules/express/lib/router/route.js:114:3)
    at Layer.handle [as handle_request] (/root/rankerxmobiledoc/node_modules/express/lib/router/layer.js:95:5)
    at /root/rankerxmobiledoc/node_modules/express/lib/router/index.js:284:15