错误：Truffle 当前使用的是 solc 0.5.16，但您的一个或多个合约指定“pragma solidity ^0.8.0”

Question

Error: Truffle is currently using solc 0.5.16, but one or more of your contracts specify “pragma solidity ^0.8.0”

Here is a photo of the error - https://gyazo.com/2f5ea2f50cc1d4ef5eea2f21d0e04fe7

All my contracts are using the ^0.8.0 pragma. My truffle-config is also using the same version as you can see here - https://gyazo.com/1ec8b28ca48902c091004f8659cf678d

Please help. Thank you very much.

Answer 1

Omit the "^". Not version:"^0.8.0"

compilers: {
       solc: {
           version: "0.8.0"  
       }

}

Answer 2

If you're using windows change your "truffle.js" file name to "truffle.config.js" and inside your truffle config file add this line of code if it doesn't exist

  compilers: {
solc: {
  version: "0.8.0" 

make sure don't use "^" in version:"0.8.0"

}
  }

Answer 3

@Yilmaz is correct that the version needs to be modified. Change the truffle-config.js file to the correct compiler version. Make sure that you have a version set. I had the same error because the version was not set. If your file looks like this:

compilers: {
  solc: {
    // version: "0.5.1",    // 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"
    // }
}

Change it to something like this:

compilers: {
  solc: {
    version: "^0.8.0"
}

Answer 4

Uncomment this line from truffle-config.js

compilers: {
  solc: {
    version: "0.8.10",  // <-- this one
    .
    .
    ...