fix: handled error

docs/quick-start/developers/nft-dapp/index.md

@@ -514,6 +514,7 @@ const GetParentChainHeight = async () => {
   } catch (error) {
     // If there's an error, log it and return an error status.
     console.error(error, "=====error in GetParentChainHeight");
+    throw new Error("Failed to Get Parent Chain Height.");
     return "error";
   }
 };