truffle-error：编译时关于solidity的版本问题

,/home/yujuan/eth_learn/eth-weibo/contracts/WeiboAccount.sol:1:1: SyntaxError: Source file requires different compiler version (current compiler is 0.4.15+commit.bbb8e64f.Emscripten.clang - note that nightly builds are considered to be strictly less than the released version
pragma solidity >=0.4.21 <0.6.0;
^------------------------------^
Compiliation failed. See above.

1、查看truffle中solidity的版本。如果低于合约中的写的版本，就升级solidity版本。重装truffle。

2、修改truffle-config.js文件。

 // Configure your compilers
  compilers: {
    solc: {
       version: "0.4.15",    // Fetch exact version from solc-bin (default: truffle's version)
      // docker: true,        // 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"
      // }
    }
  }