Cannot verify erc721 contract in testnet.snowtrace

[Sachini_Piyumali]

Hi, I want to verify my contract in snowtrace, . I followed the steps to verify using remix.

• Added the contract to remix and compiled it

• use FLATTENER to flatten the code and added the SPDX-License-Identifier: MIT

• Added flatten code to Solidity Contract Code section

• when I clicked verify and publish it gives following error

 Error! Unable to generate Contract ByteCode and ABI
 Found the following ContractName(s) in source code : AddressUpgradeable, ContextUpgradeable, CountersUpgradeable, ERC165Upgradeable, ERC1967UpgradeUpgradeable, ERC721NFTPublic, ERC721URIStorageUpgradeable, ERC721Upgradeable, IBeaconUpgradeable, IERC165Upgradeable, IERC1822ProxiableUpgradeable, IERC2981Upgradeable, IERC721MetadataUpgradeable, IERC721ReceiverUpgradeable, IERC721Upgradeable, Initializable, OwnableUpgradeable, SafeMathUpgradeable, StorageSlotUpgradeable, StringsUpgradeable, UUPSUpgradeable
 But we were unable to locate a matching bytecode (err_code_2)
 For troubleshooting, you can try compiling your source code with the Remix - Solidity IDE and check for exceptions

• Compiler Version: v0.8.7+commit.e28d00a7
• Optimization Enabled: True
• Runs: 200

Code to reproduce

Environment

• Remix
• Compiler Version: v0.8.7+commit.e28d00a7
• Optimization Enabled: True
• Runs: 200

[frangio]

Have you looked through the troubleshooting ideas in our guide?

How to verify a contract on Etherscan/BscScan/PolygonScan

Make sure to read this post before asking a question about verification. If your issue is not addressed here, just leave a comment below. If you want to pay someone to do the verification for you, create a post in #smart-contracts:developer-wanted. This guide applies to all Etherscan instances, including all of the following as well as their testnet explorers: etherscan.io (Ethereum) bscscan.com (Binance Smart Chain) polygonscan.com (Polygon) snowtrace.io (Avalanche) Resources Tutoria…

[Sachini_Piyumali]

yes . I have followed the tutorial and tried to verify the address using hardhat plugin.
it gives following error when i tried to verify proxy address.

• I never used solidity 0.8.2 version in the project

Error in plugin @nomiclabs/hardhat-etherscan: The contract you want to verify was compiled with solidity 0.8.2, but your configured compiler version is: 0.8.7.

Possible causes are:
  - You are not in the same commit that was used to deploy the contract.
  - Wrong compiler version selected in hardhat config.
  - The given address is wrong.
  - The selected network (fuji) is wrong.

• When I verify implementation address it verified successfully

• proxy address that I need to verify : https://testnet.snowtrace.io/address/0x52BA179456ee5751cED7539eCdf552Df6F2FDC5c

[frangio]

For the proxy you need to verify differently. Look in the guide for the section called "If proxy is not verified" and try to follow those instructions. Let me know how it goes.

[Sachini_Piyumali]

• I created standard input json file and tried with that, still gets error for some of the imports not for all.

• here i have attached the json file
  input_json.json (73.1 KB)

• it gives error for contract that i going to verify it self
  

  
  
  
  

[frangio]

The instructions say to use that specific solc input, not one that you generate:

I was able to verify your proxy using this file.

[Sachini_Piyumali]

Thank you. I was able to verify my other contracts too