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"

Support Contracts

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.

1 Like

Topic		Replies	Views
Compile error: The "extcodehash" instruction is not supported by the VM version "byzantium" you are currently compiling for Contracts	2	1586	February 15, 2021
Warning: The "extcodehash" instruction is not supported by the VM version "byzantium" you are currently compiling for Contracts	5	2966	August 24, 2019
Unable to run tests using ganache-cli and open-zepplin 2.4.0 Contracts	5	1211	November 11, 2019
Inheriting the OZ ERC-20 token contract - I go to compile and I get a constructor visibility error Contracts erc20 , tutorial , truffle , solidity	2	1235	December 11, 2021
PostDeliveryCrowdsale failing to compile Contracts erc20 , crowdsale , openzeppelin-contracts	6	1308	March 22, 2021

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

Related Topics