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…

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

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abcoathup December 2, 2020, 3:53am 9

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.

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

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