 if any, related to creating the wallet. Multiple messages will be delimited by newlines. (DEPRECATED, returned only if config option -deprecatedrpc=walletwarningfield is passed.)
  "warnings" : [        (json array, optional) Warning messages, if any, related to creating the wallet.
    "str",              (string)
    ...
  ]
}

Examples:
> bitcoin-cli createwallet "testwallet"
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "createwallet", "params": ["testwallet"]}'