How to solve VM Exception while processing transaction revert error

Question

I am working on truffle and running these codes to run an example:

truffle(development)> var hw  

undefined 

truffle(development)> HelloWorld.deployed().then(function(deployed){hw=deployed;}); 

undefined 

truffle(development)> hw.SayHello.call() 

I am getting the following error:

***Error: VM Exception while processing transaction: revert 

    at Object.InvalidResponse (C:\Users\dell\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:41484:16) 

    at C:\Users\dell\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:328866:36 

    at C:\Users\dell\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:324536:9 

    at XMLHttpRequest.request.onreadystatechange (C:\Users\dell\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:327565:7) 

    at XMLHttpRequestEventTarget.dispatchEvent (C:\Users\dell\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:176407:18)  

    at XMLHttpRequest._setReadyState (C:\Users\dell\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:176697:12) 

    at XMLHttpRequest._onHttpResponseEnd (C:\Users\dell\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:176852:12) 

    at IncomingMessage.<anonymous> (C:\Users\dell\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:176812:24) 

    at emitNone (events.js:111:20) 

    at IncomingMessage.emit (events.js:208:7) ***

My code is as follows:

HelloWorld.sol 

        pragma solidity ^0.4.8;

contract HelloWorld { 

   function SayHello() public returns (string) { 

        return ("SomeHello"); 

    } 

} 

2_deploy_contracts.js 

var ConvertLib = artifacts.require("./ConvertLib.sol");

var MetaCoin = artifacts.require("./MetaCoin.sol");

var HelloWorld = artifacts.require("./HelloWorld.sol");

var second = artifacts.require("./second.sol");


module.exports = function(deployer) { 

  deployer.deploy(ConvertLib);

  deployer.link(ConvertLib, MetaCoin); 

  deployer.deploy(MetaCoin); 

  deployer.deploy(HelloWorld);

  deployer.deploy(second);

}; 

My truffle.js 

module.exports = { 

  networks: { 

    development: { 

      host: "localhost", 

      port: 8545, 

      network_id: "*" // Match any network id 

    } 

  } 

};

I am working on Ubuntu 14. How do I solve it?

Answer 1

Edit your 2_deploy_contract.js file and only keep the following code in it:

var HelloWorld = artifacts.require("./HelloWorld.sol");

module.exports = function(deployer) {   deployer.deploy(HelloWorld); };

Then run your code

$ truffle compile 

Compiling .\contracts\HelloWorld.sol... 

Writing artifacts to .\build\contracts


$ truffle migrate 

Using network 'development'.


Running migration: 2_deploy_contracts.js   

Deploying HelloWorld...   

... 0xef7e895758805a3c3c9aaed7dc7c97fe7b2278b0c0d6ee8105192183a86188c9 

HelloWorld: 0x54329ff919efda7920408084590d7480a6c88243 

Saving successful migration to network...   

... 0x0954625bf66275469c9475ca21f5db20bc4667efb716c5e19bfd98a9553f4a83 

Saving artifacts...


$ truffle console 

truffle(development)> var hw 

undefined 

truffle(development)> HelloWorld.deployed().then(function(deployed){hw=deployed;}); 

undefined 

truffle(development)> hw.SayHello.call() 

'SomeHello' 

truffle(development)>

Note: Always remember to compile and migrate commands before running your code and make sure the testrpc is already running.

Answer 2

First, start testrpc. For this, open a terminal and run the following command:

$ testrpc

Next, open a new terminal and compile and migrate the contract:

$ truffle compile
$ truffle migrate

Comments

This worked, thanks! I had forget to compile and migrate after making the changes.

Answer 3

I am using windows 7. Any solution for windows system?

Comments

You can use the same solutions mentioned in the above answers. And also, you might have to change truffle.js file name to truffle-config.js