Error: TypeError: Contract "....." should be marked as abstract.

[damianlluch]

Hi, I am wanting to implement your example, but when I extend my contract with EIP12 I get these errors....
My contract is created with Solidity version 0.8.2. I don't have a constructor

Any suggestions?

thanks!

[damianlluch]

mi contract:

contract MyNFT is ERC721BurnableUpgradeable, EIP712, AccessControlUpgradeable { using SafeMathUpgradeable for uint256; using ECDSA for bytes32;