Error Compiling Code generated by ERC20 wizard

Support Contracts
1

I'm using the ERC20 wizard and getting errors when trying to compile it on remix.
It compiles ok when I don't use any of the features, but adding 1 or more of the features I get errors. It appears the code the wizard produces uses compilers 0.8.9 (main code) and 0.8.20 (imported code).
When I try compiling with version 0.8.20 I get errors like this:
TypeError: No arguments passed to the base constructor. Specify the arguments or mark "KaiToke" as abstract.
--> contracts/KaiToke.sol:8:1:
|
8 | contract KaiToke is ERC20, ERC20Burnable, Ownable {
| ^ (Relevant source part starts here and spans across multiple lines).
Note: Base constructor parameters:
--> @openzeppelin/contracts/access/Ownable.sol:38:16:
|
38 | constructor(address initialOwner) {
| ^^^^^^^^^^^^^^^^^^^^^^

And when I try compiling with version 0.8.9 I get errors like this:
ParserError: Source file requires different compiler version (current compiler is 0.8.9+commit.e5eed63a.Emscripten.clang) - note that nightly builds are considered to be strictly less than the released version
--> @openzeppelin/contracts/access/Ownable.sol:4:1:
|
4 | pragma solidity ^0.8.20;
| ^^^^^^^^^^^^^^^^^^^^^^^^

Is this me using the wizard incorrectly, or is this an issue with the wizard?

2

In the constructor of this contract, you need to call the constructor of each contract which it inherits.

In other words, in the constructor of contract KaiToke, you need to call:

  • The constructor of contract ERC20
  • The constructor of contract ERC20Burnable
  • The constructor of contract Ownable
3

Wizard uses 0.8.20 on https://wizard.openzeppelin.com/. Your version sounds out of date, where are you accessing it from?

1 Like
4

In addition to this Answer this is how you call the parent constructors.

constructor(address initialOwner) ERC20(arguments) AnyOthetInheritedConstructor(Arguments) { }
5

I'm accessing the wizard through my browser (Opera). This is what I get when I go to "https://wizard.openzeppelin.com":

Screenshot (8)
Screenshot (8)1366×724 65.5 KB

6

It looks like you are getting a cached version somehow. It should say pragma solidity ^0.8.20; at the top. Can you try a force refresh, clear browser cache, or try another browser?

7

I tried a force refresh and clear browser data, but still get that cached version. I also tried it on Brave, Chrome, and Edge; all of them giving me the same cached version.
Is it possible that I'm getting the cached version because I'm using windows 10?

8

This shouldn't be the case. I just tried it on brave, and it gives me the latest vesrion.
I'm also on windows 10.