Noninformative errors running `npx oz [command]`

Archive SDK
1

Whenever I get errors deploying or interacting with a contract using ‘npx oz [command]’ all I ever get is “Error: The execution failed due to an exception.”

Why no more information than that? Where are my error messages from require()?

1 Like
2

Hi @CrackerHax,

Welcome to the community :wave:

I’m sorry that you are having an issue running npx oz [command].

Can you share an example of what commands you have tried?

Would you mind also sharing your current environment:

  • Operating System
  • OpenZeppelin CLI version (npx oz --version)
  • Node version (node --version)
  • Npm version (npm --version)
3

Literally anything that ends up giving an error gives a totally uninformative error. I have posted about this before but never seem to get a clear answer as to why we cannot get actual errors returned from a contract. This makes oz pretty much useless if there is no way to debug, especially if you start getting errors trying to upgrade contracts.

1 Like
4

Hi @CrackerHax,

If you can help me to reproduce this then I can see how we can improve this.

5

It’s easy to reproduce. Try making a contract with a require that fails intentionally and see if you can get anything other than “Error: The execution failed due to an exception.”

1 Like
6

Here try this:

function errorTest() public
{
   bool b = false;
   require(b, "here is an error!");
}

then use npx oz call on it.

1 Like
7

Hi @CrackerHax,

I deployed the following contract to ganache-cli using OpenZeppelin CLI 2.8.
When I send a transaction I get notified of the revert reason.
What versions are you using and what do you see?

✖ Calling: 'errorTest' with no arguments
Error while trying to send transaction to 0xe78A0F7E598Cc8b0Bb87894B0F60dD2a88d6a8Ab. 
Error: Returned error: VM Exception while processing transaction: revert here is an error!

Test.sol

pragma solidity ^0.5.0;

contract Test {
    function errorTest() public {
        bool b = false;
        require(b, "here is an error!");
    }
}

Deploy

$ npx oz deploy
✓ Compiled contracts with solc 0.5.17 (commit.d19bba13)
Compilation warnings:
contracts/Test.sol:4:5: Warning: Function state mutability can be restricted to pure
    function errorTest() public {
    ^ (Relevant source part starts here and spans across multiple lines).

? Choose the kind of deployment regular
? Pick a network development
? Pick a contract to deploy Test
✓ Deployed instance of Test
0xe78A0F7E598Cc8b0Bb87894B0F60dD2a88d6a8Ab

Send Transaction

$ npx oz send-tx
? Pick a network development
? Pick an instance Test at 0xe78A0F7E598Cc8b0Bb87894B0F60dD2a88d6a8Ab
? Select which function errorTest()
✖ Calling: 'errorTest' with no arguments
Error while trying to send transaction to 0xe78A0F7E598Cc8b0Bb87894B0F60dD2a88d6a8Ab. 
Error: Returned error: VM Exception while processing transaction: revert here is an error!
8

oz 2.6, ill try 2.8 and see if that helps

1 Like
9

Nope, still getting “Error while trying to send transaction to 0x…” “Error: Error: The execution failed due to an exception.” with oz 2.8

Also there is no “npx oz deploy”…

“Invalid command: deploy
See --help for a list of available commands.”

node v10.18.1
npm v6.13.4

1 Like
10

Hi @CrackerHax,

Can you check your version of OpenZeppelin CLI? Deploy is a new command in 2.8.

$ npx oz --version
2.8.0

I am using Ganache CLI v6.9.1
Ganache CLI v6.9.1 (ganache-core: 2.10.2)

11

It was still 2.6 but after upgrading to 2.8 it is still the exact same thing.

“Error while trying to send transaction to 0x… Error: Error: The execution failed due to an exception.”

12

Not using ganache, using a live testnet.

1 Like
13

Hi @CrackerHax,

My understanding is that neither Geth nor OpenEth (Parity) yet support obtaining revert reasons unfortunately.

So we can see revert reasons with ganache-cli only currently.