@abcoathup I have actually the same problem with code (Gas estimation failed for mint in ERC721 on Remix) which is more or less a copy of ERC721PresetMinterPauserAutoId.sol
deployed on kovan : 0x09f951AC8e7414965c243E5B9817718813A2F1ce
MINTER_ROLE = bytes32: 0x9f2df0fed2c77648de5860a4cc508cd0818c85b8b8a1ab4ceeef8d981c8956a6
checked that hasRole is true for my account 0xa31F3d5d0d8A412084a3f83D253340524F7f8897
and still I get the gas estimation error when I try to mint(0x123…, 1, 5)
pragma solidity >=0.6.0 <0.8.0;
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/contracts/token/ERC721/ERC721Pausable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/contracts/token/ERC721/ERC721Burnable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/contracts/access/AccessControl.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/contracts/access/Ownable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/contracts/utils/Counters.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/contracts/token/ERC20/SafeERC20.sol";
/**
* @dev {ERC721} token, including:
*
* - ability for holders to burn (destroy) their tokens
* - a minter role that allows for token minting (creation)
* - a pauser role that allows to stop all token transfers
* - token ID and URI autogeneration
*
* This contract uses {AccessControl} to lock permissioned functions using the
* different roles - head to its documentation for details.
*
* The account that deploys the contract will be granted the minter and pauser
* roles, as well as the default admin role, which will let it grant both minter
* and pauser roles to other accounts.
*/
contract DTOParticipationNFT is Context, AccessControl, ERC721Burnable, ERC721Pausable {
using Counters for Counters.Counter;
bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
Counters.Counter private _tokenIdTracker;
struct TicketData {
uint256 ticketNumberFrom;
uint256 ticketAmount;
}
TicketData[] public ticketData;
/**
* @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the
* account that deploys the contract.
*
* Token URIs will be autogenerated based on `baseURI` and their token IDs.
* See {ERC721-tokenURI}.
*/
constructor(string memory name, string memory symbol, string memory baseURI) public ERC721(name, symbol) {
_setupRole(DEFAULT_ADMIN_ROLE, _msgSender());
_setupRole(MINTER_ROLE, _msgSender());
_setupRole(PAUSER_ROLE, _msgSender());
_setBaseURI(baseURI);
}
/**
* @dev Creates a new token for `to`. Its token ID will be automatically
* assigned (and available on the emitted {IERC721-Transfer} event), and the token
* URI autogenerated based on the base URI passed at construction.
*
* See {ERC721-_mint}.
*
* Requirements:
*
* - the caller must have the `MINTER_ROLE`.
*/
function mint(address to, uint256 _ticketNumberFrom, uint256 _ticketAmount) public virtual {
require(hasRole(MINTER_ROLE, _msgSender()), "DTOParticipationNFT: must have minter role to mint");
// We cannot just use balanceOf to create the new tokenId because tokens
// can be burned (destroyed), so we need a separate counter.
ticketData[_tokenIdTracker.current()] =
TicketData({
ticketNumberFrom: _ticketNumberFrom,
ticketAmount: _ticketAmount
});
_mint(to, _tokenIdTracker.current());
_tokenIdTracker.increment();
}
function getNumberOfMintedNFT() public view returns (uint256) {
return _tokenIdTracker.current();
}
function getTicketData(uint256 tokenId) public view returns (uint256, uint256)
{
return (
ticketData[tokenId].ticketNumberFrom,
ticketData[tokenId].ticketAmount
);
}
function getTokenURI(uint256 tokenId) public view returns (string memory) {
return tokenURI(tokenId);
}
// ERC721Pausable -----------------------------------------------------------------------------------------------------------
/**
* @dev Pauses all token transfers.
*
* See {ERC721Pausable} and {Pausable-_pause}.
*
* Requirements:
*
* - the caller must have the `PAUSER_ROLE`.
*/
function pause() public virtual {
require(hasRole(PAUSER_ROLE, _msgSender()), "ERC721PresetMinterPauserAutoId: must have pauser role to pause");
_pause();
}
/**
* @dev Unpauses all token transfers.
*
* See {ERC721Pausable} and {Pausable-_unpause}.
*
* Requirements:
*
* - the caller must have the `PAUSER_ROLE`.
*/
function unpause() public virtual {
require(hasRole(PAUSER_ROLE, _msgSender()), "ERC721PresetMinterPauserAutoId: must have pauser role to unpause");
_unpause();
}
function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual override(ERC721, ERC721Pausable) {
super._beforeTokenTransfer(from, to, tokenId);
}
}
