📝 Ensure 404.html is generated by Nuxt.

nuxt.config.js

@@ -117,6 +117,7 @@ export default {
       }
     }]
   ],
+
   /*
   ** Build configuration
   */
@@ -126,5 +127,12 @@ export default {
     */
     extend (config, ctx) {
     }
+  },
+
+  /*
+  ** Generate configuration
+  */
+  generate: {
+    fallback: true
   }
 }