Questions tagged [error]

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Can not Open Ethereum Wallet on Window 10

I did trying install soft Ethereum wallet on windows 10, But I can't open the program. It looks like the picture below. Help me pls, Thank everyone.
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0answers
21 views

No error message returned in Ropsten [closed]

I deployed my smart-contract in ropsten test net after successful testing in local test net. I have used a modifier that has following code require(taskFlag == false, "Task already created.")...
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0answers
9 views

Raise & return error with message if no key found in mapping

I am writing a test that should fail because it looks for a key that doesn't exist on a mapping. How can I raise the error with and error message in solidity? this is the test: it('Should NOT update ...
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1answer
20 views

Error in code Expected pragma, import directive or contract/interface/library definitio

I am getting the below error when i compile the below code. Using remix compiler version 0.5.11 ****browser/TodoList.sol:7:2: ParserError: Expected pragma, import directive or contract/interface/...
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0answers
21 views

Error: The send transactions “from” field must be defined!

I get this error, even though I do specify the transaction sender.Here is my code: for(let a=1; a<TEST_ORACLES_COUNT; a++) { await config.flightSuretyApp.registerOracle({from: accounts[a], ...
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0answers
24 views

Type error, unit256 is not implicitly convertible to expected type struct

Using sol compiler 0.5.1 I am trying to fetch data from old smart contract's function called people, the smart contract is already deployed on the blockchain mapping(address => Person ) public ...
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0answers
19 views

Trying to deploy a simple contract using node and getting the error: Unhandled Promise Rejection / Contract code couldn't be stored

I am doing an online course and trying to deploy using node. Can anyone help ID what I might be doing wrong. Thank you for any help! The error is below, followed by the js code. iii@iii:~/Digital ...
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1answer
67 views

While testing wrap & unwrap of ETH to WETH on Kovan ,however the wrap function is fine but unwrap func fails,is anything wrong in my approach?

trx fails at & debug at tenderly pragma solidity 0.5.12; contract WETH9_ { mapping (address => uint) public balanceOf; mapping (address => mapping (address => ...
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0answers
21 views

How to deploy huge contracts using web3?

I have a huge contract (which exceeds the default contract code size set in Quorum). I have increased the Code size and Transaction size in the Genesis file to 128Mb. The contract works well when ...
2
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0answers
25 views

Are there well-solved patterns and practices for handling errors in Solidity?

In the spirit of Are there well-solved and simple storage patterns for Solidity?... Are there known, battle-tested practices for how to deal with errors in large Solidity codebases? It's common in ...
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1answer
27 views

Getting this error `ValueError: {'code': -32000, 'message': 'insufficient funds for gas * price + value'}` on raw transaction send

I know for sure I have enough eth on account. Some prelims: I am signing a raw transaction with web3.py, like so: transaction = { 'to': '0xSENDHEREFINALLYPLEASE', 'value': 1000, 'gas': ...
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1answer
43 views

Error when sending multiple transactions

I'm having a weird issue with the code below in that sometimes it works and sometimes it doesn't. It seems more apparent when TRANSACTIONS is set to a larger number. I have had it fail AND pass with ...
2
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1answer
603 views

Uniswap V2 smart contract integration reverts attempt at swapping ETH for tokens

I'm trying to integrate Uniswap V2 into my contract but my attempts at making a trade (ETH to Token) always gets reverted. Here is my solidity code: pragma solidity ^0.6.0; // Included the ...
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0answers
31 views

deployment error

everyone! Doing Dapp on Etheryum. When the contract was deployed, the Error: The data field must be HEX encoded data began to fly out. I do it on a site under Web3 \ JS. Thought the old js resource. ...
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0answers
81 views

Why error 'Fail with error 'Storage: Unpermissioned operator <0xc3d5d60630bc63eb1a07228cc5028cada1cc4c7b>' arises?

I wants to deposit & withdrawal DAI (https://kovan.etherscan.io/address/0xc4375b7de8af5a38a93548eb8453a498222c4ff2) to SOLO Margin(dydx) smart Contract at Kovan testnet (https://kovan.etherscan....
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1answer
16 views

When i am doing migration, the netwrok name is ganache instead of development and multiple errors are there

D:\>truffle migrate --reset Compiling your contracts... =========================== > Compiling .\contracts\Migrations.sol > Artifacts written to D:\build\contracts > Compiled ...
1
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1answer
60 views

Error: Invalid bytes6 value

I'm trying to create a TicketPurchaser application. Here is the whole code for the smart contract, although I think the problem I'm asking about is a type error, most of the code is not important. ...
1
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1answer
27 views

Public / Internal modifier spawns error: This type is only supported in the new experimental ABI encoder [duplicate]

I have this code snippet: pragma solidity >=0.5.0 <0.7.0; import "@aztec/protocol/contracts/libs/NoteUtils.sol"; library EscrowUtils { using NoteUtils for bytes; struct Note { ...
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0answers
54 views

Unexpected fault address

I picked up an Ethereum Blockchain at AWS ECS almost 3 months ago, it was working perfectly until I got this bug yesterday from the mining node: unexpected fault address 0x7fb93c71d000 [signal SIGBUS:...
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2answers
32 views

Etherscan says there is not enough ether, why?

Etherscan says there is not enough ether, why? Arguments, which i enter => requestLoan(3,31,3) and after change account, provideGuarantee(0,3) I have created dApp and how it looks in my code you can ...
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1answer
2k views

Getting error -> unexpected token. You may need an appropriate loader to handle this file type

root@kali:~/Documents/oraclize-test# npm run dev truffle-oraclize-api@0.0.2 dev /root/Documents/oraclize-test webpack-dev-server ERROR in ./app/javascripts/app.js Module parse failed: /root/...
1
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1answer
325 views

truffle unbox pet-shop gives DownloadingError: read ECONNRESET at TLSWrap.onStreamRead (internal/stream_base_commons.js:201:27)

Ubuntu 18.04. Truffle v5.1.2 (core: 5.1.2) Solidity v0.5.12 (solc-js) Node v13.2.0 Web3.js v1.2.2 When I execute truffle unbox pet-shop on terminal, I get error ✔ Preparing to download ⠼ ...
2
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1answer
42 views

Solidity. Find whether a key exists in a mapping. Then get its value

I have a simple mapping: mapping(address => string) professorsExam; How can I check if msg.sender is a key in this mapping, and if it is, get its value? If it isn't I should return something. ...
1
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1answer
111 views

Issue with selfdestruct() getting an error

main contract function which calls my secondary contract function gameOver(uint _matchId)public payable onlyOwner returns(bool) { Match my_match = Match(matchTracker[_matchId]); bool success ...
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1answer
87 views

invalid implicit conversion from contract to address requested contract

I am using this function to create a new contract instance of Match contract which takes 4 parameters. However i am getting this error message "invalid implicit conversion from contract to address ...
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2answers
46 views

Assertion error running truffle test

I can't seem to understand where this error comes from. Maybe someone can help My token solidity file : pragma solidity >=0.4.2 <0.6.0; contract LairToken { //Name string public ...
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0answers
73 views

Error: Returned values aren't valid, did it run Out of Gas based on YT Tutorial

I red the other Threads about this case, but couldn't fixed the problem. I got this tutorial for Scmart contracts: https://www.youtube.com/watch?v=coQ5dg8wM2o&feature=youtu.be However the ...
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0answers
26 views

What is Parser Error? [closed]

What is Parser Error? How to solve this problem?
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0answers
64 views

How can MetaMask alert about transaction errors before they are caused?

The MetaMask extension has this feature to warn about transaction errors before a transaction is being made: ALERT: Transaction Error. Exception thrown in contract code. How is this done? A dry ...
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0answers
21 views

Geth error: Genesis not found in chain - error on the worker node!

Good afternoon. After restarting the server when trying to run get I get an error. Start command: geth --rpc --rpcport 8545 --rpccorsdomain "*" --rpcapi "db,eth,net,web3,personal" --cache 8192 --...
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1answer
128 views

rpc error with payload and exception thrown in contract code

This is the problem I get when trying to run my contract! And then when I go ahead and run it, this pops up This is my js code: import React, { Component } from 'react'; import Web3 from 'web3'; ...
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3answers
432 views

Remix Deploy Error encoding arguments

I'm building a simple fund raising smart contract and having problems deploying this through Remix. I'm wanting to set the "goal" and "minimum contribution" values (in wei) during the contract ...
-3
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2answers
118 views

Trying to create an instance of an abstract contract

pragma solidity ^0.5.0; import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol'; contract SubToken{ mapping(address => uint) balances; ...
2
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1answer
183 views

How does one retrieve revert/require error messages from RPC

In both of these questions, the user is asking if it's possible to get the error string from a revert or require. The answers say, basically, "Yes" and point to Truffle or other methods. VM Exception ...
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1answer
154 views

create ERC-20 token from a contract function

I would like to do a function create contract with ERC-20 interface. But I have a few problems. If anyone help me I’ll be appreciated. Here’s the code : pragma solidity ^0.5.0; import 'https://...
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1answer
89 views

create contract from function / contract

**Hey guys ! I just try to make a contract for create a contract. It supposed to be ERC-20 interface so my first contract for this. But I don’t know how can I do _mint and createContract functions ...
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1answer
44 views

Expected identifier but got reserved keyword 'reference' Product public reference; ^-------^ [closed]

hello guys I am a beginner. I would like to make a function for create a contract. I found a example on the internet but gives me an error so I dont know what should I do. Anyone can help me ? ...
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2answers
339 views

Error: gas required exceeds allowance or always failing transaction in Remix using Ropsten network

I am facing this error , My Contract is quite simple pragma solidity ^0.5.0; contract sendEther { address payable sender; function showReceiver() public view returns (address payable) { ...
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2answers
21 views

it'll give me a parser error

pragma solidity ^0.5.0; contract fisrtCoin { address deployer; mapping(address=>uint) balances; public function fisrtcoin() { deployer = msg.sender; } public ...
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1answer
224 views

'types/values length mismatch',

Hey guys I had a problem with my return function here's my smart contract : pragma solidity >=0.4.0 <0.7.0; contract NewHello{ address owner; address newOwner; constructor()public{ ...
1
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1answer
786 views

Function declared as view, but this expression (potentially) modifies the state requires payable

I'm trying to change the an address data variable to a one, which is selected via a function. Keep getting the below error. Function declared as view, but this expression (potentially) modifies the ...
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3answers
788 views

ParserError: Expected ',' but got identifier

pragma solidity >=0.4.0 <0.7.0; contract NewHello{ struct kullanicilar{ string name; string surname; uint age; } event infoChanged( string name, ...
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0answers
387 views

Etherscan says “we were unable to locate a matching bytecode (err_code_2)”

Please help me with this error... I dont know what is it?
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1answer
532 views

Transaction Error. Exception thrown in contract code. (MetaMask)

When I use Ganache it runs with no problem and MetaMask too. When I run my contract in my private Ethereum network (Geth). When I use a function from my contract the MetaMask gives me this error (...
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0answers
38 views

Get the address of a contract without using Remix-ide

I'm studying Ethereum, I need to get the contract address for interact with web3, I can not use Remix-IDE for this since that I installed Kali as an operating system. How I get the contract address ...
2
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2answers
420 views

Syntax Error: Type tuple(bool,bytes memory) is not implicitly convertible to expected type bool

I am trying to compile the following program: pragma solidity ^0.5.1; contract MKotET1_1{ address payable king; uint public claimPrice = 100; function calculateCompensation() public ...
1
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1answer
47 views

call: Warning: Unused local variable

I am trying to compile the following code: pragma solidity ^0.5.1; contract MKotET1_1{ address payable king; uint public claimPrice = 100; function calculateCompensation() public returns(uint)...
2
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1answer
30 views

I have a ParserError here “function Stratus(string _greeting) {”

pragma solidity ^0.4.19; contract Stratus { string public greeting; address public owner; event GreetingChanged (string oldGreeting, string newGreeting) function Stratus(string ...
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2answers
560 views

Type uint256 is not implicitly convertible to expected type int256

I'm trying to compile the following keep getting an error, even though used this before in second code and its working fine. Simply trying to change the temp to the new temperature set by the user, so ...
1
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1answer
724 views

MetaMask - RPC Error: Error: WalletMiddleware - Invalid “from” address

I'm trying to create a simple Dapp (via tutorial) which would allow me to send Ether from sender to receiver (via a contract with an address that automatically approves the transaction). The truffle ...