I would like to learn how ERC721 token works. I found some sample contracts online and tried to use remix and Ethereum Wallet to deploy the contract. The compile was fine but failed in the creation. The error message on remix is
"creation ERC721 error: Transaction failed, invalid address. If you use an injected provider, please check it is properly unlocked".
Can anyone help me? what can I do to fix the problem? Thank you.