인프런 커뮤니티 질문&답변
작성한 질문수
hello.say() is not a function
작성
·
180
2
배포2 단원에서 truffle console --network development 후
truffle(development)> var hello = HelloWorld.at("0x9876ff5b2729D2800f87852F7be329D32B35c244")
undefined
truffle(development)> hello.say()
Thrown:
evalmachine.:0
hello.say()
^
TypeError: hello.say is not a function
at evalmachine.:0:7
at Script.runInContext (vm.js:135:20)
at runScript (C:Users데모버전AppDataRoamingnpmnode_modulestrufflebuildwebpack:packagestruffle-corelibconsole.js:199:1)
at Console.interpret (C:Users데모버전AppDataRoamingnpmnode_modulestrufflebuildwebpack:packagestruffle-corelibconsole.js:213:1)
at ReplManager.interpret (C:Users데모버전AppDataRoamingnpmnode_modulestrufflebuildwebpack:packagestruffle-corelibrepl.js:118:1)
at bound (domain.js:425:14)
at REPLServer.runBound [as eval] (domain.js:438:12)
at REPLServer.onLine (repl.js:650:10)
at REPLServer.emit (events.js:197:13)
at REPLServer.EventEmitter.emit (domain.js:481:20)
이렇게 에러가 뜨는데 어떻게 해결해야 하나요?
답변 3
3
버전이 달라서 저는 지금 마이그레이트를 하면 프롬프트에 이렇게 떠서 HelloWorld를 디플로이 했을 시 생긴 컨트랙트주소 부분을 사용해야 언디파인드가 되고 hello.say()를 했을 시 문자열이 잘나타났습니다! 혹시 저와 같은 버전으로 하고 계신분들 참고해주세요!
Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.
Starting migrations...
======================
> Network name: 'development'
> Network id: 5777
> Block gas limit: 6721975 (0x6691b7)
1_initial_migration.js
======================
Deploying 'Migrations'
----------------------
> transaction hash: 0xa83a42953525bba41c94b902b3bcfa09dc90fcf3a18a77f66b52b797cefc7758
> Blocks: 0 Seconds: 0
> contract address: 0x5B6c3496D20404A3e0755487B2d809D7174E2cC9
> block number: 1
> block timestamp: 1614761582
> account: 0xFfc1DC506c8D47144DBA97435b102FaE4c5BD39b
> balance: 99.99616114
> gas used: 191943 (0x2edc7)
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.00383886 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.00383886 ETH
2_hello_deploy.js
=================
Deploying 'HelloWorld'
----------------------
> transaction hash: 0xe3769cf3541753b8ad4a76c5a52da9926368a39cd5c1e7a9cf9a72dfc1a162c4
> Blocks: 0 Seconds: 0
> contract address: 0xe5A71c2b65D2BB74D25121EBfd73C979854F086e
> block number: 3
> block timestamp: 1614761583
> account: 0xFfc1DC506c8D47144DBA97435b102FaE4c5BD39b
> balance: 99.989001
> gas used: 315669 (0x4d115)
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.00631338 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.00631338 ETH
Summary
=======
> Total deployments: 2
> Final cost: 0.01015224 ETH
1
먼저 트러플 버전을 확인하고
truffle version
5.x대의 버전이라면 Contract.at 사용시 다음과 같이 await를 앞에 써주어야 합니다.
var hello = await HelloWorld.at("0x9876ff5b2729D2800f87852F7be329D32B35c244")
트러플 버전 4.x에서는 await를 붙이지 마시고요.
0