Questions tagged [truffle]

Questions regarding the implementation and use of the Truffle development and testing environment.

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106 views

Manage accounts in Remix Web3 Provider env connected to a TestRPC client node

When I run the TestRPC client (ganache-cli), it provides me with 10 different accounts and private keys along with a local server at localhost:8545 Available Accounts (0) ...
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51 views

Problem with Bonding Curve Contract from Relevant

I’m trying to get the relevant bonding curve contract to work. The only thing I changed is that I added an older compiler version in truffle config. compilers: { solc: { version: "^0.4.25", }...
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72 views

Oraclize: Truffle migrate failed

I'm trying to migrate a contract into a ganache chain. It needs to use Oraclize - in the end, the plan is to have a private chain using Oraclize via ethereum-bridge. However, truffle migrate fails ...
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303 views

Truffle.js file is not created with truffle init command

I have run the truffle init command successfully with creating the following directories and files such as contracts, migrations, test, and truffle-config.js but the one file is missing as truffle.js? ...
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1answer
115 views

Solidity <address>.send() doesn't create a separate transaction?

I am new to Ethereum and I deployed a contract in Ganache which has a function like this: function withdraw(uint256 amount) public payable returns(bool) { require(accounts[msg.sender].balance &...
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1answer
108 views

I have written a javascript code for compiling the solidity code but it's showing error

I was trying to compile my contract using solc compiler but it returning me some errors. I will place my solidity code along with the error that I am getting here. Please help me out to sort this ...
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150 views

TypeError: event.watch is not a function [duplicate]

I'm following this tutorial and when I'm using truffle test to test my React app, I keep getting the following exception error thrown: TypeError: event.watch is not a function I am sure the event is ...
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211 views

How do you set up a Truffle script with Infura as provider?

I'm trying to set up my Truffle scripts to use Infura as a provider. I have the following, which appears to set everything up correctly: const HDWalletProvider = require("truffle-hdwallet-provider");...
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1answer
94 views

web3-core-method.umd.js:1191 Uncaught (in promise) Error: Transaction has been reverted by the EVM:

Keep getting this error and really not sure what's causing it. Smart contract: contract BasaltStore { // struct of how a document will be stored struct documentStore { // unique id of the ...
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2answers
408 views

truffle migrate --network ropsten issues

When i run truffle migrate --network ropsten i don't see the contract deployment but just Compiling your contracts... =========================== > Everything is up to date, there is nothing to ...
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2answers
50 views

I can't migrate the contract using truffle init

I am working to build a Dapp using Ganache, Web3, and Truffle frameworks. I am unable to compile the contracts using truffle compile. I am facing an error. I want to explain you in detail what I did. ...
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1answer
189 views

truffle test get different results between ganache-cli and local geth

When I run truffle test on ganache-cli, it will pass the test but when I run the same truffle test commnad on local geth node, it will fail with error saying invalid address at the method which takes ...
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1answer
34 views

Is there a good erc20 source using web3js?

I'm looking for some source codes using web3js for interaction with erc20 tokens and contracts. Does anyone know good source codes using web3js? Thanks in advance!
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1answer
324 views

Truffle tries deploy from unknown account

I am trying to deploy a contract to Ropsten using Infura with the config file truffle.js below. The deploy fails because the account listed in the error message has insufficient funds – however I do ...
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143 views

Issue calling one contract from another using Quorum

I'm using truffle and running locally with 4 quorum nodes, trying to call another contract's function, but keep getting 0 in return instead of the expected value the I get once calling the contract ...
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2answers
262 views

After compiling contract, there is no build directory inside project directory?

After writing 'truffle compile' in terminal , it just give the message i.e. compiling your contracts...and exit, no build directory is formed in Project directory. What is the issue?
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1answer
84 views

how to parse values returned by one contract into another?

I've two contracts deployed one is UserRegistration and another is Exam I've getUser(uint id) method to fetch data of particular user using users mapping, function getUser(uint _id) public constant ...
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137 views

How to use multiple app.js in truffle project?

I'm new to blockchain and currently developing small application for educational purpose using solidity. I am using truffle framework and stuck at a point. currently there is only one app.js file in ...
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1answer
1k views

Truffle console error “Error: Returned error: VM Exception while processing transaction: revert”

I compiled and migrated my solidity codes of erc20 token to development networks on truffle, and use it on truffle console. truffle(development)> let instance = await XToken.deployed() truffle(...
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68 views

HTTP query create request error for oraclize

I have tried to deploy a sample contract having oraclizer query using truffle+ethereum bridge+solidity. First ethereum bridge made up and got OAR address which is used in sample contract in ...
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2answers
342 views

Solidity & truffle: get elements from strings array

i'm glad to follow this forum, it is very helpful. I'm using truffle to develop contracts and i just found that dynamic arrays are not yet suported, for that reason i was using string arrays with a ...
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2answers
46 views

truffle pet shop example question(address convert) [duplicate]

I have some question about truffle pet shop example ,here is the original link pet shop, when I work this command:truffle test , and I have some compile problem. here is original code: I have some ...
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1answer
37 views

Event suddenly disapears when i call another function in my contract

So i am doing a factory for an ERC20 token contract, here is my factory code: pragma solidity >= 0.4.0 < 0.6.0; import "./ERC20.sol"; import "./ERC20Interface.sol"; contract Factory { ...
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1answer
360 views

Web3 not connecting with ropsten through infura

so my truffle based application is communicating fine with my smart contracts on my private network, ganache and ganache-cli. I then deployed it to ropsten where i used the endpoint i got from infura....
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1answer
132 views

Invalid JSON Response while connecting DApp, Metamask and Backend

I am getting some error(picture below) while trying to connect DApp with a backend. One day ago, everything worked fine, now I got an error: "basic auth failure". Contracts are deployed on Ropsten ...
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168 views

Revert on ERC20.transferFrom

I am getting Error: Returned error: VM Exception while processing transaction: revert when testing MyContract.deposit() Here are simplified versions of my code to highlight where the issue is ...
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355 views

Truffle migrate not working with 2_deploy_contracts.js

I have made a sample contract using Truffle's pet-shop. I have also added the 2_deploy_contracts.js file. I have changed the solidity version and also the constructor() public {} to comply with the ...
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1answer
90 views

Truffle Pet Shop Tutorial App.js - Send Multiple Form Values to Function

Working through a little project using the Truffle Pet Shop as the starting point and hit a wall. It looks like this is the piece in App.js that fires the handleAdopt function: bindEvents: function() ...
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0answers
121 views

unable to deploy contract on rinkeby network

I am trying to deploy my contract to rinkeby test network but unable to do so here is my contract code. pragma solidity ^0.4.17; contract Inbox { string public message; function Inbox(string ...
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1answer
1k views

Specify different solc compiler for different files in truffle?

I am using truffle, and have a number of x.sol files in the contracts directory, different files require different versions of the compiler - how do i deal with that? I think i SHOULD be able to do ...
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1answer
176 views

ParsedContract.sol:1:17: ParserError: Token incompatible with Solidity parser as part of pragma directive

Code : git clone https://github.com/dappuniversity/election https://github.com/dappuniversity/election/tree/2019_update Errors faced : Commands: Compile: truffle compile Migrate: ...
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1answer
138 views

Smart Contract function keep return Null value?

Hey I am new with Solidity. And I just tried to link my front end view with the smart contract. With the simplest possible approach. My contract:- My JS code:- Console keep printing 'null' I don't ...
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1answer
418 views

truffle migrate does not return anything

I am following the tutorial from Truffle to create a "pet shop" contract. I can follow everything until he tells me to truffle migrate. Here is the contract: pragma solidity ^0.5.0; contract ...
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1answer
32 views

MetaMask repeated errors with LocalHost

Every time I try to send ETH to my locally deployed contract I get errors like this: -While the error message says "out of gas" I know that can't be true since all my accounts have like 100ETH in ...
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1answer
427 views

Unhandled Rejection (Error): invalid string value (arg=“x”, coderType=“string”, value=5)

Using Truffle unbox react to unbox a boilerplate. received the following error from running npm run start Changes: Addition of "memory" parameters in the simpleStorage.sol Changed unit to string in ...
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1answer
60 views

Execution gas cost

I use web3 and truffle to get info about my testnet transactions. There are few fields about gas used per transaction, such as: gasPrice, gas, gasUsed. But how to get field 'execution cost'?
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119 views

Web3 Contract Constructor Error

Currently getting this error in my Browser's Console: My current set up is as follows: Truffle v5.0.3 (core: 5.0.3) Solidity - 0.5.0 (solc-js) Node v8.9.4 Here's my code - and note that I'm using ....
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0answers
210 views

How to call contract method from specific address and private key without Metamask check

Good morning, I need to known how call contract method in javascript from specific address(and relative private key) without the check of Metamask. I explain better. This is an example of js code, ...
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1answer
382 views

Truffle test scripts - Help Please [duplicate]

I want to know if my syntax is correct not how to catch a revert. the task is: Call bid method from accounts[1] of Auction.sol using auctionInstance and pass itemId=0, count=6 as arguments it("...
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237 views

Transferring ether balance from contract balance to winner,not working

here is my Solidity snippet: function deliverPrizes(address payable winner) public onlyOwner{ winner.transfer(address(this).balance); } This is what I wrote on truffle console: dCoders....
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2answers
483 views

access mapping inside mapping of struct in Solidity ^0.5.0

I have a contract which looks like this: contract a { struct Str { uint256 totalTokens; mapping(address => uint256) playerTokens; } mapping(uint256 => Str) public ...
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1answer
367 views

How to change the account that is interacting with the deployed smart contract on Ganache? [duplicate]

When I enter truffle console and start interacting with the deployed contract truffle uses the first address, how to change the address for testing ? user@user:~/workspace/smart-contract$ truffle ...
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2answers
89 views

find the bytecode of a contract during compilation

Is there a solution to recover the complete bytecode (init + runtime) of a contract imported in solidity. For example "bytes code = getBytecode (Escrow.sol)" and this would be replaced by bytecode ...
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795 views

FATAL ERROR: Rebalance Allocation failed - process out of memory

So while running truffle compile for my contracts on AWS Ubuntu server I got the following error: <--- Last few GCs ---> [17055:0x3985730] 11958 ms: Scavenge 511.7 (553.4) -> 506.9 (553.4) ...
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1answer
631 views

Build failed SyntaxError: Unexpected token: name (length)

I setup truffle unbox react-auth and add few libraries as shown in my package.json below. I have no problem running npm run start but failed to compile npm run build with the following error: ...
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267 views

How to `truffle migrate` to private permissioned network?

I am running a private permissioned network and would like to use Truffle v5.0.1 for deployment. I use it according to the documentation: Compile my project with truffle compile so that the ./build ...
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0answers
158 views

Invalid opcode on estimateGas 'code': -32000

this is my contract : pragma solidity >=0.4.21 <0.6.0; contract CloudProject { uint public nbCandidates = 0; uint public nbBureau = 0; uint public nPartiPouvoir = 0; ...
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1answer
583 views

Migrates contract with specific account without hard-code address using truffle and Genache

Block Builders! I am trying to migrate my two smart contracts using truffle and Genache. I would like to specify the deploying accounts existing locally. However, when I try to migrate the contracts I ...
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1answer
340 views

web3 Uncaught TypeError: Cannot read property 'createBox' of undefined

i'm trying to create simple application by using solidity 5.0.0 , Truffle v5.0.0 and web3 web3@1.0.0-beta.34. but i've gotten Uncaught TypeError: Cannot read property 'createBox' of undefined. ...
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1answer
43 views

SC Truffle Testing: Domain Object Returned?

Working through some tests in Truffle to become more acquainted with the environment but am running into an issue. What I am trying to do Test a smart contract with, among others, the following ...

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