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Truffle Compile Fails with Error " Expected pragma, import directive or contract/interface/library/struct/enum/constant/function definition"

When running truffle compile in the root directory of my project I get the following error: ParserError: Expected pragma, import directive or contract/interface/library/struct/enum/constant/function ...
1 vote
1 answer
329 views

Crowdsale - Invalid implicit conversion from contract IERC20 to contract ERC20 requested

I am using ^0.8.0 version of solidity compiler and trying to add crowdsale smart contract pragma solidity ^0.8.0; import "./Crowdsale.sol"; contract MyTokenSale is Crowdsale { ...
0 votes
1 answer
969 views

Compilation Error

Hi guys I got this error when I try to compile using truffle develop. truffle(develop)> compile Compiling your contracts... Compiling ./contracts/StarNotary.sol /mnt/d/Blockchain/...
0 votes
1 answer
436 views

Compiler Version not Found After Downloading

When I truffle compile, it says "Error: Could not find a compiler version matching ^0.8.11". I did some research and installed solc (npm install -g [email protected]), but it didn't fix the error. ...
1 vote
1 answer
813 views

Running Truffle Compiler, Babel-register missing

I fixed my truffle config file so it's working properly require('babel-register'); require('babel-polyfill'); require('dotenv'); config(); module.exports = { networks: { development : { ...
0 votes
1 answer
413 views

Im getting the following error: ParserError: Expected primary expression. struct ManagingOrder.Parking memory new_Parking = Parking({

Im using blockchain technology for the first time, for a college project. Im trying to run a smart contract from Github. After debugging the errors shown while compiling the smart contract (in ...
2 votes
1 answer
2k views

what is 'UnimplementedFeatureError: Not yet implemented - FixedPointType' error?

what is 'UnimplementedFeatureError: Not yet implemented - FixedPointType' error in solidity while compiling through truffle ? How to fix it ? Using solidity compiler version - 0.5.9
1 vote
2 answers
1k views

Facing an error while running "truffle compile"

I'm facing an error while running truffle compile- Error: Failed to fetch the Solidity compiler from the following locations: https://relay.trufflesuite.com/solc/bin/,https://solc-bin.ethereum.org/bin/...
5 votes
3 answers
2k views

TypeError: "send" and "transfer" are only available for objects of type "address payable", not "address"

I'm currently trying to test run source code from GitHub based on a 2018 tutorial where solidity was using version 0.5.16. I'm currently using truffle v4.1.14. I understand that there was an update ...
4 votes
4 answers
3k views

"Migrations" hit an invalid opcode while deploying on deploy Migrations.sol with Truffle

An error occurs when truffle migrate try to deploy Migrations.sol contract, i don't understand why pragma solidity >=0.4.21 <0.6.0; contract Migrations { address public owner; uint public ...
1 vote
1 answer
99 views

Problems installing truffle

I've installed truffle multiple times, uninstall and installed again, all I get is command not found npm install -g truffle npm WARN deprecated [email protected]: testrpc has been renamed to ganache-cli, ...
0 votes
0 answers
105 views

abortHandshake(this, req, `Unexpected server response: ${res.statusCode}`);

truffle migrate --network sepolia Compiling your contracts... Everything is up to date, there is nothing to compile. /mnt/c/pr0/bootcamp-completed/node_modules/ws/lib/websocket.js:542 abortHandshake(...
3 votes
5 answers
4k views

Truffle artifacts are not being generated when compiling

I am new to smart contract development and I am trying to deploy my first contract. When running the truffle compile for the first time I can see that a build folder was generated on my project ...
1 vote
3 answers
5k views

ParserError: Expected '{' but got reserved keyword 'override'

Can someone explain to me about this error? I just tried override feature in Solidity v0.6, but I got error Expected '{' but got reserved keyword 'override' function totalSupply() public override ...
3 votes
3 answers
9k views

Unused function parameter. Remove or comment out the variable name to silence this warning

I have a smart contact which have 2 owner address and 3 functions. my set functions is set a users with msg.sender and my getUser functions is returns name,surname and age and I want to add a admin ...
0 votes
1 answer
1k 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? ...
2 votes
3 answers
1k views

Slither not working with Truffle imports

Currently I have a project that needs slither run against it so I pulled down the docker image for slither as specified in the docs here https://hub.docker.com/r/trailofbits/slither/, then I shared ...
3 votes
4 answers
4k views

ParserError: Expected identifier, got 'LParen'

I am following the truffle tutorial for creating a token. I get this error when trying to compile the contract. ParserError: Expected identifier, got 'LParen' constructor () public { ...
1 vote
2 answers
8k views

Truffle: Error: Could not find a compiler version matching 0.5.0

I wonder why I get the error when I have v0.5.0 everywhere and do the following: In my Action.sol: pragma solidity ^0.5.0; In Migrations.sol: pragma solidity >=0.5.0 <0.6.0; When running truffle ...
6 votes
2 answers
4k views

How to pass a blank bytes calldata into a solidity function call?

I have a function that looks like this: function foo(uint _someVar, bytes calldata _data) public { ... } Then I make a call to it from another function with "" as _data: foo(123, "&...
0 votes
1 answer
54 views

Type Error with Function

I have been following a course, and, I followed their code, somehow, when I compile my code, it gave me an error, and the course I followed didn't get an error, somebody help me please. pragma ...
1 vote
2 answers
2k views

Error with "truffle compile" - Could not find a compiler version matching

I keep getting this error: Error: Could not find a compiler version matching ^0.8.0. Please ensure you are specifying a valid version, constraint or build in the truffle config. Run `truffle compile --...
1 vote
0 answers
86 views

Why Solidity no deterministic AST

Question: I read that why recompile all truffle The technical reason is that since Solidity does not produce deterministic ASTs, the plugins are unable to resolve references correctly if they are not ...
2 votes
0 answers
141 views

Truffle compiles different binary than RemixIde, even with same compiler version and evm version

The code: pragma solidity <0.9.0; contract Callee { address public a; address public b; function test(uint256 i) public returns(uint256){ a=address(this); b=msg....
0 votes
0 answers
63 views

Truffle with weird behavior dealing with uint type of variables

I´ve spent a couple weeks try to understanding what was heppening. The same solidity code worked great in REMIX but not in Truffle/Ganache. Let´s me explain. I wrote a code bases on Openzeppelin, but ...
0 votes
1 answer
100 views

unable to install truffle

I'm trying to install truffle on node version 8.9.0 but it shows it has been installed and when I try to do anything on that, throws this error. C:\Users\com\AppData\Roaming\nvm\v8.9.0\node_modules\...
4 votes
1 answer
7k views

Solidity ^0.6.0 Truffle Compile Error: Cannot read property ... of undefined

I initalised a new truffle project by using truffle init. I changed the solc version to ^0.6.0 in the truffle-config.js file. I ran truffle compile and got this error: TypeError: Error parsing C:/init-...
1 vote
2 answers
1k views

Truffle compile fails: could not find file from any sources

I'm following the steps of this tutorial. I created a simple contract, TodoList.sol pragma solidity ^0.5.0; contract TodoList { uint public taskCount = 0; } Then I run truffle compile and get ...
1 vote
1 answer
176 views

Can an ABI file be made from separate json files by stripping out information?

I am looking at the CryptoKitties KittyCore contract. What I notice is that there are multiple contracts within the file. (https://etherscan.io/address/0x06012c8cf97bead5deae237070f9587f8e7a266d#code)....
0 votes
2 answers
189 views

Problem with smart contract deployment

I have compiled test crowdsale smart contract with inheriting from other contracts( like TestToken is MintableToken). The main smart contract consists only of one file, where I described all ...
1 vote
1 answer
112 views

Truffle console no compile or init options

While using truffle.cmd console I tried to use the compile option, or even init. These options are not available, so I cannot compile using console. truffle(development)> .help .break Sometimes ...
1 vote
0 answers
73 views

Truffle-config outputSelection is not working

I'm trying to only select the truffle compile output using the outputSelection JSON config in truffle-config.json. But when I run truffle compile --all, the build JSON files still contains everything. ...
0 votes
1 answer
161 views

Why is "Methods" Always Empty When Building Solidity Smart Contract With Truffle?

When I the ABI for any smart contract it always creates "methods" as just an empty object... it should contain my public and external functions, but it doesn't. When I look at the ABI I don'...
0 votes
1 answer
51 views

Unable to run truffle console

When I'm running the truffle compile cmd getting the prompt "Everything is upto date." ABIS folder is created but the corresponding file related to contacts are not there. Basically, the ...
0 votes
1 answer
141 views

How to fix error of compiling the smart contract: Invalid number of parameters for "undefined"?

I want to compile a simple smart contract using truffle. my smart contract SimpleStorage.sol pragma solidity >=0.4.16 <0.7.0; contract SimpleStorage { int public sensorData; constructor(...
0 votes
1 answer
184 views

ERC721Burnable TypeError: Definition of base has to precede definition of derived contract

I'm getting an error due to Burnable but it's not even in my contract. @openzeppelin/contracts/token/ERC721/ERC721Burnable.sol:12:46: abstract contract ERC721Burnable is Context, ERC721 ...
0 votes
0 answers
177 views

In my solidity file I have a parser Error but the line where truffle tells me the error has occurred is blank

I am building out a token and while testing using truffle my file failed to compile. pragma solidity ^0.5.0; import "openzeppelin-solidity/contracts/math/SafeMath.sol"; contract Token { ...
1 vote
2 answers
3k views

Set specific compiler version in truffle but still get "Source file requires different compiler version" error

I get the "Source file requires different compiler version (current compiler is 0.8.6+commit.11564f7e.Emscripten.clang)" at the first line: pragma solidity ^0.7.0; In truffle-config.js, I ...
0 votes
2 answers
1k views

Truffle Deployment Error: has no network configuration for its current network id (97)

I'm having an issue deploying a contract with Truffle. The contract constructor takes 7 parameters which are all within the 2_deploy_xxx.js file. However, every time I do, I get an error when I get to ...
2 votes
1 answer
1k views

I ran into an error when using Pragma Solidity 0.4.24

I use pragma solidity 0.4.24 on the smart contract, but when running the truffle compile command, an error appears like this: =========================== > Compiling ./contracts/ImageRegister.sol &...
0 votes
1 answer
607 views

When I run truffle compile I get a ParserError: syntax error

Error i'm getting back when I run truffle compile ParserError: Expected ';' but got 'contract' How my contract looks: pragma solidity ^0.6.0; import "@openzeppelin/contracts/token/ERC721/...
0 votes
1 answer
521 views

truffle solc specific compiler fail

,/C/Users/juhne/ipfs-image-dapp/contracts/Migrations.sol:1:1: ParserError: Source file requires different compiler version (current compiler is 0.5.16+commit.9c3226ce.Emscripten.clang - note that ...
2 votes
0 answers
183 views

Is it possible to create a button "connect to wallet"?

I'm learning web3 and blockchain in general. I'd like to create a button that says "connect to wallet " in order to connect with metamask wallet, but I do not know if 1- I need to connect ...
2 votes
1 answer
944 views

UnimplementedFeatureError: Encoding type "struct BiddingContract.Bidder memory" not yet implemented

The code is broken with the new upgrade v0.5, using Truffle v5.0.1 (core: 5.0.1) struct Bidder { address bidders_address; uint productId; uint bidValue; } struct Product { uint ...
0 votes
0 answers
26 views

Received DeclarationError when calling other contracts file name and its function

So I created 2 contracts where the first one will be the app logic contract and the other one is the database contract. So I tried to "truffle compile" my contract but receive ...
0 votes
2 answers
151 views

Compile error on address.call

My syntax seems to be ok, so I do not understand this CompileError
4 votes
2 answers
1k views

Truffle Compile with Solidity 0.5.0

I just upgraded my code to Solidity 0.5 and am trying to use the truffle framework with it. I did update my code in Remix and it does seem to work. The problem I have is that I am unable to compile ...
1 vote
1 answer
103 views

Error: "Expected ',' but got 'memory'" in Nodejs/truffle console when trying to compile

CompileError: /C/Users/Asusupernova/Downloads/TrufflePart2/contracts/Hello.sol:8:30: ParserError: Expected ',' but got 'memory' constructor(string _name memory) public { ...
1 vote
1 answer
735 views

CompilerError: Stack too deep, try removing local variables [duplicate]

While trying to fetch more than 6 variables I am having an issue. /** * Get data based on report id */ function getData(uint256 id) public view returns ( ...
0 votes
0 answers
468 views

TypeError: Cannot read property '0' of undefined AND TypeError: eventAdded.watch is not a function

I'm currently trying to test run source code from GitHub based on a 2018 tutorial where solidity was using version 0.5.16. I'm currently using truffle v4.1.14. Appreciate any help. Thanks! In the ...