The example app is out of date

[Amy-Centrality]

The example app in here https://wiki.cennz.net/#/Dapp-development/Examples/Example-demo-app isn't functional
The repository is here https://github.com/cennznet/api-example-app

Steps to reproduce:

• Follow the steps to set up and run a dev chain
• Run node index.js balances

Expected result:
Show balances

Actual result:
Connecting to ws://localhost:9944 2021-04-15 16:09:18 RPC-CORE: getMetadata(at?: BlockHash): Metadata:: createType(Metadata):: Unable to create Enum via index 12, in V0, V1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V11 2021-04-15 16:09:18 API/DECORATOR: Error: FATAL: Unable to initialize the API: getMetadata(at?: BlockHash): Metadata:: createType(Metadata):: Unable to create Enum via index 12, in V0, V1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V11 at EventEmitter.Init._onProviderConnect (/Users/amy/Documents/repos/playground/api-example-app/node_modules/@polkadot/api/base/Init.js:55:23) at processTicksAndRejections (internal/process/task_queues.js:93:5) Error: Error: Connection fail at EventEmitter.rejectError (/Users/amy/Documents/repos/playground/api-example-app/node_modules/@cennznet/api/Api.js:42:16) at EventEmitter.emit (/Users/amy/Documents/repos/playground/api-example-app/node_modules/eventemitter3/index.js:202:33) at Api.emit (/Users/amy/Documents/repos/playground/api-example-app/node_modules/@polkadot/api/base/Events.js:21:31) at EventEmitter.Init._onProviderConnect (/Users/amy/Documents/repos/playground/api-example-app/node_modules/@polkadot/api/base/Init.js:57:14) at processTicksAndRejections (internal/process/task_queues.js:93:5)

Note this app also mentions it's a PlugNet API example app, and a better readme