5 truffle编译sol文件时报错

# 编译sol文件时报错
**网上各种方法都试了：什么降低版本，尝试权限，多试几次，连接外网，在ubuntu上的环境试了不行，在windows上环境试了不行**
报错如下：
```
× Fetching solc version list from solc-bin. Attempt #1
× Fetching solc version list from solc-bin. Attempt #2
× Fetching solc version list from solc-bin. Attempt #3
Error: Could not find a compiler version matching 0.5.16. Please ensure you are specifying a valid version, constraint or build in the truffle config. Run `truffle compile --list` to see available versions.
    at VersionRange.errors (C:\Users\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\compile-solidity\compilerSupplier\loadingStrategies\LoadingStrategy.js:66:1)
    at VersionRange.getSatisfyingVersionFromCache (C:\Users\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\compile-solidity\compilerSupplier\loadingStrategies\VersionRange.js:81:1)
    at VersionRange.load (C:\Users\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\compile-solidity\compilerSupplier\loadingStrategies\VersionRange.js:197:1)
Truffle v5.1.39 (core: 5.1.39)
Node v12.15.0
```

编译sol文件时报错

网上各种方法都试了：什么降低版本，尝试权限，多试几次，连接外网，在ubuntu上的环境试了不行，在windows上环境试了不行 报错如下：

× Fetching solc version list from solc-bin. Attempt #1
× Fetching solc version list from solc-bin. Attempt #2
× Fetching solc version list from solc-bin. Attempt #3
Error: Could not find a compiler version matching 0.5.16. Please ensure you are specifying a valid version, constraint or build in the truffle config. Run `truffle compile --list` to see available versions.
    at VersionRange.errors (C:\Users\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\compile-solidity\compilerSupplier\loadingStrategies\LoadingStrategy.js:66:1)
    at VersionRange.getSatisfyingVersionFromCache (C:\Users\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\compile-solidity\compilerSupplier\loadingStrategies\VersionRange.js:81:1)
    at VersionRange.load (C:\Users\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\compile-solidity\compilerSupplier\loadingStrategies\VersionRange.js:197:1)
Truffle v5.1.39 (core: 5.1.39)
Node v12.15.0

0 条评论
分类：以太坊

最佳答案 2020-08-18 22:31

请检查配置文件中的版本

当前错误设置的版本是一个无效的版本：

  compilers: {
    solc: {
      version: "1.5.16",    // 请注意这里
      docker: false,        // Use "0.5.1" you've installed locally with docker (default: false)
      settings: {          // See the solidity docs for advice about optimization and evmVersion
       optimizer: {
         enabled: false,
         runs: 200
       },
       evmVersion: "byzantium"
      }
    },
  },

你可以尝试修改 truffle-config.js 中的 version版本字段，比如可以设置为 0.5.16

相信，你如果这样做的话，应该能够编译通过的。