Solidity version error on Etherscan for verifing #5445

ptdatta · 2023-05-06T14:07:55Z

ptdatta
May 6, 2023

My solidity versions are 0.8.0 and 0.8.8 but on verifying the contract etherscan gives error NomicLabsHardhatPluginError: Etherscan only supports compiler versions 0.4.11 and higher.
Full error:

reusing "BasicNFT" at 0x05342f309d4C1Fb467D33c8CE5478D8bd69880AB
Verifying...
Verifying contract...
NomicLabsHardhatPluginError: Etherscan only supports compiler versions 0.4.11 and higher.
See https://etherscan.io/solcversions for more information.
    at SimpleTaskDefinition.action (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/@nomiclabs/hardhat-etherscan/src/index.ts:629:13)
    at Environment._runTaskDefinition (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:35)
    at Environment.run (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:25)
    at /home/parthib/Web3/Etherum/NFTMarketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:289:29
    at SimpleTaskDefinition.verifySubtask [as action] (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/@nomiclabs/hardhat-etherscan/src/index.ts:214:44)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at Environment._runTaskDefinition (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at verify (/home/parthib/Web3/Etherum/NFTMarketplace/utils/verify.js:6:9)
    at Object.module.exports [as func] (/home/parthib/Web3/Etherum/NFTMarketplace/deploy/00-deploy-basicnft.js:31:9)
----------------------------------------------------
----------------------------------------------------
reusing "NFTMarketplace" at 0xc7f08eb7c4a6f829e6d508e946352317f2c5e49e
Verifying...
Verifying contract...
NomicLabsHardhatPluginError: Etherscan only supports compiler versions 0.4.11 and higher.
See https://etherscan.io/solcversions for more information.
    at SimpleTaskDefinition.action (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/@nomiclabs/hardhat-etherscan/src/index.ts:629:13)
    at Environment._runTaskDefinition (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:35)
    at Environment.run (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:25)
    at /home/parthib/Web3/Etherum/NFTMarketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:289:29
    at SimpleTaskDefinition.verifySubtask [as action] (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/@nomiclabs/hardhat-etherscan/src/index.ts:214:44)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at Environment._runTaskDefinition (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/home/parthib/Web3/Etherum/NFTMarketplace/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at verify (/home/parthib/Web3/Etherum/NFTMarketplace/utils/verify.js:6:9)
    at Object.module.exports [as func] (/home/parthib/Web3/Etherum/NFTMarketplace/deploy/01-deploy-nftmarketplace.js:24:9)
----------------------------------------------------
Done in 14.05s.

hardhat.config file:

require("@nomicfoundation/hardhat-toolbox");
require("@nomiclabs/hardhat-etherscan");
require("hardhat-deploy");
require("solidity-coverage");
require("hardhat-gas-reporter");
require("hardhat-contract-sizer");
require("dotenv").config();

const SEPOLIA_RPC_URL =
  process.env.SEPOLIA_RPC_URL ||
  "https://eth-sepolia.g.alchemy.com/v2/YOUR-API-KEY";
const POLYGON_MAINNET_RPC_URL =
  process.env.POLYGON_MAINNET_RPC_URL ||
  "https://polygon-mainnet.alchemyapi.io/v2/your-api-key";
const PRIVATE_KEY = process.env.PRIVATE_KEY || "0x";
// optional
const MNEMONIC = process.env.MNEMONIC || "your mnemonic";

// Your API key for Etherscan, obtain one at https://etherscan.io/
const ETHERSCAN_API_KEY =
  process.env.ETHERSCAN_API_KEY || "Your etherscan API key";
const POLYGONSCAN_API_KEY =
  process.env.POLYGONSCAN_API_KEY || "Your polygonscan API key";
const REPORT_GAS = process.env.REPORT_GAS || false;

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
  defaultNetwork: "hardhat",
  solidity: {
    compilers: [
      {
        version: "0.8.8",
      },
      {
        version: "^0.8.0",
      },
    ],
  },
  networks: {
    hardhat: {
      // // If you want to do some forking, uncomment this
      // forking: {
      //   url: MAINNET_RPC_URL
      // }
      chainId: 31337,
    },
    localhost: {
      chainId: 31337,
    },
    sepolia: {
      url: SEPOLIA_RPC_URL,
      accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
      //   accounts: {
      //     mnemonic: MNEMONIC,
      //   },
      saveDeployments: true,
      chainId: 11155111,
    },
    polygon: {
      url: POLYGON_MAINNET_RPC_URL,
      accounts: PRIVATE_KEY !== undefined ? [PRIVATE_KEY] : [],
      saveDeployments: true,
      chainId: 137,
    },
  },
  etherscan: {
    // npx hardhat verify --network <NETWORK> <CONTRACT_ADDRESS> <CONSTRUCTOR_PARAMETERS>
    apiKey: {
      sepolia: ETHERSCAN_API_KEY,
      polygon: POLYGONSCAN_API_KEY,
    },
  },
  gasReporter: {
    enabled: REPORT_GAS,
    currency: "USD",
    outputFile: "gas-report.txt",
    noColors: true,
    // coinmarketcap: process.env.COINMARKETCAP_API_KEY,
  },
  contractSizer: {
    runOnCompile: false,
    only: ["NftMarketplace"],
  },
  namedAccounts: {
    deployer: {
      default: 0, // here this will by default take the first account as deployer
      1: 0, // similarly on mainnet it will take the first account as deployer. Note though that depending on how hardhat network are configured, the account 0 on one network can be different than on another
    },
    player: {
      default: 1,
    },
  },
  mocha: {
    timeout: 200000, // 200 seconds max for running tests
  },
};

Answered by alymurtazamemon

May 9, 2023

@Parthib314 The compiler version you were using was not supported for some dependencies. After changing it to solidity: "0.8.17", and updating the contracts version to ^0.8.17 it is working fine and verifying the contracts.

View full answer

alymurtazamemon · 2023-05-06T14:12:58Z

alymurtazamemon
May 6, 2023

@Parthib314 Here everything looks correct, just you do not need these things if you are using hardhat toolbox plugins, maybe it is due to it. But you can leave repo if it does not work so I can see full code.

+ require("@nomicfoundation/hardhat-toolbox");
- require("@nomiclabs/hardhat-etherscan");
require("hardhat-deploy");
- require("solidity-coverage");
- require("hardhat-gas-reporter");
- require("hardhat-contract-sizer");
require("dotenv").config();

7 replies

ptdatta May 6, 2023
Author

Here is the repo.

alymurtazamemon May 7, 2023

@Parthib314 Cannot find the repo.

ptdatta May 7, 2023
Author

Oops sorry. Here is it.

alymurtazamemon May 9, 2023

@Parthib314 The compiler version you were using was not supported for some dependencies. After changing it to solidity: "0.8.17", and updating the contracts version to ^0.8.17 it is working fine and verifying the contracts.

Answer selected by ptdatta

ptdatta May 9, 2023
Author

I thought older compiler versions like 0.8.7,0.8.8 are more stable than newer ones. Is there any guidance regarding selecting the compiler versions?? The error isn't from Etherscan side right as I verified many contracts with older solidity versions???

alymurtazamemon May 10, 2023

@Parthib314 There is no guide for selecting compiler versions, people just realize this after trial and testing. Just like that, Patrick recommended using some compiler versions for stability and ^0.8.17 is one of them.

0xV4L3NT1N3 May 10, 2023

If your concern has to do with Solidity compiler versions supported by Etherscan, here's a full list!

0xV4L3NT1N3 · 2023-05-09T08:11:28Z

0xV4L3NT1N3
May 9, 2023

Do you mind sharing which chains you deployed this on ? I tried checking the deployment addresses and they don't seem to be deployed to any chain

3 replies

ptdatta May 9, 2023
Author

I deployed it on sepolia network.

ptdatta May 9, 2023
Author

You can check the contracts on sepolia etherscan. They are deployed successfully but the problem occurs in verification.

0xV4L3NT1N3 May 10, 2023

The issue appears to be with your Solidity compiler settings, you have to specify a specific compiler version in hardhat.config.js to use such as 0.8.0, rather than any compiler using the arrow wildcard ^0.8.0.

You can allow your Solidity file to be compiled with a range of compiler versions such as anything above 0.8.8 below

pragma solidity ^0.8.8;

However for your compiler settings you have to specify an exact version to use, within the range of accepted versions above

solidity: {
    compilers: [
      {
        version: "0.8.8",
      },
      {
        version: "0.8.0",
      },
    ],
  },

I've succesfully verified your contract after changing your compiler version to remove the ^ symbol.

Solidity version error on Etherscan for verifing #5445

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ptdatta May 6, 2023 Author

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ptdatta May 9, 2023 Author

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ptdatta May 9, 2023 Author

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ptdatta May 9, 2023 Author

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