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排错：调用只读方法时，遇到 UNPREDICTABLE_GAS_LIMIT

 3 years ago
source link: https://blog.dteam.top/posts/2021-03/unpredictable-gas-limit.html
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排错：调用只读方法时，遇到 UNPREDICTABLE_GAS_LIMIT

胡键 Posted at — Mar 10, 2021 阅读 78

开发以太坊应用时，调用只读方法时遇到类似以下内容的报错信息：

ERROR Error: Uncaught (in promise): Error: cannot estimate gas; transaction may fail or may require manual gas limit (error={"code":-32000,"message":"execution reverted"}, method="call", transaction={"to":"0xE6183d3094b9r360B121Ec1330afAE76A74d1cbF","data":"0xdb699765000000000000000000000000b2b7bedd7d7fc19804c7dd4a4e8174c4c73c220d0000000000000000000000000000000000000000000000000de0b6b3b7640000000000000000000000000000000000000000000000000000000000006c915aef"}, code=UNPREDICTABLE_GAS_LIMIT, version=providers/5.0.24)
    at d.makeError (main.a577643548eb15e6832e.js:1)
    at d.throwError (main.a577643548eb15e6832e.js:1)
    at Z (main.a577643548eb15e6832e.js:1)
    at $e.<anonymous> (main.a577643548eb15e6832e.js:1)
    at Generator.throw (<anonymous>)
    at a (main.a577643548eb15e6832e.js:1)
    at l.invoke (polyfills.797d13e303959ed8dd77.js:1)
    at Object.onInvoke (main.a577643548eb15e6832e.js:1)
    at l.invoke (polyfills.797d13e303959ed8dd77.js:1)
    at a.run (polyfills.797d13e303959ed8dd77.js:1)
    at Z (polyfills.797d13e303959ed8dd77.js:1)
    at polyfills.797d13e303959ed8dd77.js:1
    at a (main.a577643548eb15e6832e.js:1)
    at l.invoke (polyfills.797d13e303959ed8dd77.js:1)
    at Object.onInvoke (main.a577643548eb15e6832e.js:1)
    at l.invoke (polyfills.797d13e303959ed8dd77.js:1)
    at a.run (polyfills.797d13e303959ed8dd77.js:1)
    at polyfills.797d13e303959ed8dd77.js:1
    at l.invokeTask (polyfills.797d13e303959ed8dd77.js:1)
    at Object.onInvokeTask (main.a577643548eb15e6832e.js:1)

看到上面这样的信息，十有八九会让开发者摸不着头脑，但最可能的原因是：调用了合约中不存在的方法。这种情况在 ethers.js 搭配 Human-Readable ABI 时尤其容易出现：比如因手抖而导致的拼写错误。

检查调用地址（上文中的 to）对应的合约中是否有要调用的方法并进行修改。


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