pragma solidity ^0.6.0;
import "./ERC721.sol";
string constant name = "MyToken";
string constant symbol = "MTKN";
contract Mytoken is ERC721(name, symbol) {
}
the error is "Expected pragma, import directive or contract/interface/library/struct/enum definition."
When you declare a variables in Solidity, you must to do into a contract. Change your smart contract with this: