Hi, I am having trouble trying to compile a simple ERC20 token contract and the Crowdsale.sol doc. I had compiled my simple ERC20 token with the most current version of OpenZeppelin, however, I had to switch to OZ 2.5 to incorporate the Crowdsale.sol. Now I am getting the following errors: I had to…

@abcoathup thank you. I took your guidance on this and changed my contract to this: constructor( string memory name, string memory symbol, uint256 initialSupply ) public ERC20Detailed(name, symbol, 18) { _mint(_msgSender(), initialSupply); } } I managed t…

[image] crypto_economics: The "extcodehash" instruction is not supported by the VM version "byzantium" Hey, I think you should increase the compile version to 0.5.5, cause petersburg was added in 0.5.5

@skyge but all of the OZ contracts are 5.0. Should I go and change them all to 5.5?

I think they use pragma solidity ^0.5.0;, so you can change your compile version in the config file.

@Skyge but don’'t the pragma in OZ smart contracts and truffle-config compiler version have to match? So do I use 5.0 or 5.5 for all?

In contract, use pragma solidity ^0.5.0;, so in your config, you can use 0.5.5, they are compatible.

Hi @crypto_economics , Have a look at Simple ERC20 Crowdsale . You need to compile with Solidity 0.5.5 or a later 0.5 version.

@Skyge @abcoathup hi thank you for your help! That worked however, I was having some trouble compiling the contracts as my simpletoken ccontract is setup a bit different: pragma solidity ^0.5.0; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/ownership/Owna…

Hi @crypto_economics , Your ERC20 above is using a constructor which names a name and symbol, this is in OpenZeppelin Contracts 3.x. In OpenZeppelin Contracts 2.x we use ERC20Detailed. See: Simple ERC20 Crowdsale .

Hi @abcoathup thank your explanation. I will try and run my tests again however they worked on my original contract based on OpenZepp 3.x and ERC20.sol. Do you anticipate any problems? const BigNumber =web3.BigNumber; const BN = require('bn.js'); const { should, use } = require('chai'); const MyTok…

Hi @crypto_economics , I don’t see a reason for your tests not to pass. You are using standard ERC20 functionality. The only thing that may change is any constructor parameters when you create your token.

Compiling ERC20: Warning: The "extcodehash" instruction is not supported by the VM version "byzantium"

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Compiling ERC20: Warning: The "extcodehash" instruction is not supported by the VM version "byzantium"

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