fix

Author: openweb3

demo/package.json

@@ -13,6 +13,7 @@
   "dependencies": {
     "@open-web3/pvq": "^0.7.0",
     "@polkadot/api": "^16.0.1",
+    "@polkadot/types": "^16.0.1",
     "@polkadot/util": "^13.5.1",
     "@radix-ui/react-accordion": "^1.2.11",
     "@radix-ui/react-dialog": "^1.1.14",
@@ -46,4 +47,4 @@
     "tw-animate-css": "^1.3.0",
     "typescript": "^5"
   }
-}
+}