Ensure that you have created a wallet and have it open

[sychen12345]

When I try to use this example
https://developers.eos.io/welcome/v2.0/tutorials/tic-tac-toe-game-smart-contract-single-node
$ cleos wallet list
Wallets:
[
"local *"
]
Excuse me, what is the reason

[matthewdarwin]

For questions, better use use stack overflow.