> Unhandled rejection Error: Returned error: The method personal_unlockAccount does not exist/is not available
    at Object.ErrorResponse (/Users/neo/ethereum/web3/node_modules/web3-core-helpers/src/errors.js:29:16)
    at /Users/neo/ethereum/web3/node_modules/web3-core-requestmanager/src/index.js:137:36
    at XMLHttpRequest.request.onreadystatechange (/Users/neo/ethereum/web3/node_modules/web3-providers-http/src/index.js:77:13)
    at XMLHttpRequestEventTarget.dispatchEvent (/Users/neo/ethereum/web3/node_modules/xhr2/lib/xhr2.js:64:18)
    at XMLHttpRequest._setReadyState (/Users/neo/ethereum/web3/node_modules/xhr2/lib/xhr2.js:354:12)
    at XMLHttpRequest._onHttpResponseEnd (/Users/neo/ethereum/web3/node_modules/xhr2/lib/xhr2.js:509:12)
    at IncomingMessage.<anonymous> (/Users/neo/ethereum/web3/node_modules/xhr2/lib/xhr2.js:469:24)
    at IncomingMessage.emit (events.js:165:20)
    at endReadableNT (_stream_readable.js:1101:12)
    at process._tickCallback (internal/process/next_tick.js:152:19)
		
		

解决方法

		
$ geth --rpc --rpcapi personal,db,eth,net,web3
		
		

在 --rpcapi 选项中增加 personal