Questions tagged [error]

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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
8 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 ...
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1answer
19 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. ...
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1answer
19 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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22 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
25 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
366 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/...
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1answer
194 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 ⠼ ...
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1answer
29 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. ...
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1answer
106 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
46 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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18 views

Assertion error running truffle test

I cant 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 name = "Lair ...
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49 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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22 views

What is Parser Error? [closed]

What is Parser Error? How to solve this problem?
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0answers
45 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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17 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
73 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
253 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 ...
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2answers
86 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; ...
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1answer
121 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
111 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
55 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
37 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
208 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
19 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
147 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{ ...
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1answer
413 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
441 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
291 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
335 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
32 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 ...
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2answers
288 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 ...
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1answer
32 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
26 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
264 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 ...
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1answer
471 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 ...
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0answers
22 views

How to process null TransactionReceipt?

I have some transaction that is sent and from time to time when I call the eth_getTransactionReceipt I get a null. I see esentially two approaches for handling this: I could reiterate the call to ...
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1answer
729 views

TRUFFE MIGRATE: Saving migration to chain.Error: Error: Error: Returned error: VM Exception while processing transaction: invalid opcode

$ truffle migrate Compiling your contracts... =========================== > Everything is up to date, there is nothing to compile. Starting migrations... ====================== > Network name: ...
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0answers
78 views

Using web3j with infura returns null

I've used web3.js to handle my contracts, and it worked very well. But web3j is pretty hard for me since the beginning. I'm using android studio, infura, web3j. Since I don't know very much about ...
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0answers
29 views

DeclarationError: Undeclared Identifier. Did you mean “_data”? data = _data ^__^. All i want is to create a cryptocurrency

pragma solidity ^0.5.1; contract owner { address public owner; function owned() public { owner = msg.sender; } function set( string memory _data) public { data = ...
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0answers
35 views

How to handle estimate gas cost error?

I am programming a button for a transaction which shall only appear if the transaction is possible. Therefore, I am using the following code contract.methods.function(parameters) .estimateGas({...},...
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3answers
72 views

Solidity Compatibility Configuration

I am a cyber security analyst who is new to ethereum and working on a project to study crypto security. It's a series of 22 vulnerable smart contracts that you're supposed to exploit. For anyone who ...
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0answers
62 views

Accidentally sent REN (ETH token) to my ETH contract address using my Ledger Nano S. Can someone help please? [duplicate]

I sent REN (ETH token) to my ETH contract address by accident while using my ledger nano s. Can someone help me understand what's happened to the tokens and if I can retrieve my REN token from my ETH ...
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0answers
41 views

MetaMask returns different error - not longer working

I am calling the MetaMask promt successfully with this: ethereum.enable().then(response => { console.log("ABC"); }).catch(error => { console.log("XYZ") }); However, when I disagree ...
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0answers
40 views

Error while deploying smart contract ,BadFunctionCallOutput

The log i am having while deploying a smart contract: -------- load log data -------- user.address = 0x2154f8B602c470ae7F10f242DCC88Ae6221bb263 contract.address = ...
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0answers
68 views

Cannot read property length of undefined in Remix / tried to increase gas not working

My contract was working just fine, but I don't know what happened, now when I try to interact with a new instance of my contract from Remix I get this error 'cannot read property "length" of undefined'...
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2answers
422 views

Why am I Getting: Transaction Error. Exception thrown in contract code in Real?

WE Had Create A Dapp Like POWHD, we Already Deployed It And Some Of Transactions Are Already Done well. But After Some Time The issue I'm encountering with my real contract (Dapp) is that trying to ...
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1answer
37 views

Why does updating an external variable results in an error?

I'm trying to update a variable within an external contract. My 2 contracts are as follow: pragma solidity ^0.4.25; contract MainContract { string public variable1; function setVariable1(string ...
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113 views

- does not trigger a Solidity `revert` statement

My Smart contact was running smoothly .I was smoothly executing the function successfully . MinterFunction(address account, uint256 value) public { value = value.mul(1 finney); require(...
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2answers
27 views

Simple contract throws for no apparent reason

the thing is that i have a very simple contract code that I wrote as a kind of "Hello World!", but it doesn't seem to work properly, and I can't see any reason why it wouldn't work. The code I'm ...