问题：
我已经克隆了Hyperledger-Indy SDK存储库，然后尝试运行nodeJs示例。首先，我发出命令npm run ledger: start，然后发出npm install，然后在nodejs文件夹内运行npm run start。之后，我得到了
> [email protected] start /home/tharindu/indy-sdk/samples/nodejs
> node src/main.js
gettingStarted.js -> started
Open Pool Ledger: pool1
done
(node:4013) UnhandledPromiseRejectionWarning: IndyError: PoolLedgerTimeout
at Object.callback (/home/tharindu/indy-sdk/samples/nodejs/node_modules/indy-sdk/src/wrapIndyCallback.js:15:10)
(node:4013) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:4013) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
此错误在终端上。有人可以帮我解决这个问题吗？我做了很多尝试，以找到解决此问题的方法，但无法找到解决此问题的方法。谢谢。
我已经安装了包含壁架的泊坞窗，所以我使用泊坞窗通过以下命令运行池分类帐：
sudo docker run -itd -p 9701-9708:9701-9708 indy_pool
如果您没有安装docker并运行分类帐，我向您推荐此链接，只需几个步骤：https://medium.com/akeo-tech/step-by-step-guide-to-set-up-hyperledger-indy-64eeb524f558