More often than not, a contract will return a "token does not exist" error when the token is not yet minted. It's important to note that the token ID may, however, exist at a later date once it is minted. If you are confident that the token ID you provided should exist, you can retry your query at a later date. Once the token has been minted and recognized by our service, your request may succeed. Note that some contracts do return un-minted tokens, so this error message is not to be used as an indicator for whether a token has been minted yet.