Error on Events triggering

[marsniper27]

Ethers Version

6.02

Search Terms

events, event

Describe the Problem

While creating event listeners upon receipt of event an error occurs. Simplified example provided.
This is occurring for multiple contracts and events. Switching to v5.7.2 the events work fine.

Code Snippet

const { ethers } =  require(`ethers`);

const newEthersClient = new ethers.providers.JsonRpcProvider('https://rpc.ankr.com/polygon/486f6d938d85e35aeacf83a59afd95c4fab739093c8f919adb258799d81d51bf');

abi = [
    "event Transfer(address indexed from, address indexed to, uint amount)"
  ]
  
  contract = new ethers.Contract("0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063", abi, newEthersClient)
  
  // Begin listening for any Transfer event
  contract.on("Transfer", (from, to, _amount, event) => {
    const amount = ethers.formatEther(_amount, 18)
    console.log(`${ from } => ${ to }: ${ amount }`);
  
    // The `event.log` has the entire EventLog
  
    // Optionally, convenience method to stop listening
    event.removeListener();
  });

Contract ABI

[
    "event Transfer(address indexed from, address indexed to, uint amount)"
  ]

Errors

Uncaught TypeError TypeError: unknown ProviderEvent (argument="event", value="{\"topics\":[\"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef\"],\"address\":[\"0x8f3cf7ad23cd3cadbd9735aff958023239c6a063\"]}", code=INVALID_ARGUMENT, version=6.0.2)

Environment

node.js (v12 or newer)

Environment (Other)

No response

[ricmoo]

The problem seems to be that the specified backend does not support the eth_newFilter method.

In v5, polling was always used, which is why it continues to work.

In v6, it is supposed to detect this and fallback onto polling, so I'm looking into why it isn't. I think it has to do with detection. When Geth doesn't support filters, it returns a null filter ID, while it looks like Polygon throws an error instead.

[samuelmonday699]

Where did you need?

[ricmoo]

This should be fixed now. Let me know if you have any more issues.

Thanks! :)

[marsniper27]

Just tested and seems to be working on JsonRPC but still same error if i try with a websocket.