truffle migrate Error

Question

I can´t migrate the standart contracts that come with truffle init. Here´s what i do:

truffle init
truffle compile
truffle migrate

and this is what it generates when i init:

But when i migrate , the following list of errors shows up:

Error: Invalid JSON RPC response: ""
at Object.InvalidResponse (/usr/local/lib/node_modules/truffle/node_modules/web3/lib/web3/errors.js:35:16)
at XMLHttpRequest.request.onreadystatechange (/usr/local/lib/node_modules/truffle/node_modules/web3/lib/web3/httpprovider.js:115:32)
at XMLHttpRequestEventTarget.dispatchEvent (/usr/local/lib/node_modules/truffle/node_modules/xhr2/lib/xhr2.js:64:18)
at XMLHttpRequest._setReadyState (/usr/local/lib/node_modules/truffle/node_modules/xhr2/lib/xhr2.js:354:12)
at XMLHttpRequest._onHttpRequestError (/usr/local/lib/node_modules/truffle/node_modules/xhr2/lib/xhr2.js:544:12)
at ClientRequest.<anonymous> (/usr/local/lib/node_modules/truffle/node_modules/xhr2/lib/xhr2.js:414:24)
at emitOne (events.js:96:13)
at ClientRequest.emit (events.js:188:7)
at Socket.socketErrorListener (_http_client.js:309:9)
at emitOne (events.js:96:13)

Answer 1

As webjunkie comments:

1. testrpc
2. Check your truffle.js config port and ip is set to default 'localhost:8545'
3. truffle migrate

Answer 2

For Solidty To Migrate, The Local Ethereum Blockchain should be running already and the Smart Contract you want to migrate should go to the correct Local Ethereum Blockchain so you need to check the Port Number of the Local Ethereum Blockchain.

1. ganache-cli or testrpc (For Making a local Blockchain). It has the port number on which it is running written beneath. Such as http://localhost:8545 .
2. Go to truffle.js file and check that port should be 8545 .
3. Now Migrate the Smart Contract using truffle migrate .

Answer 3

合同名称不应与功能名称相同。