Cannot read properties of undefined (reading 'length') for "buildProveWithdrawal" function

[qiushui777]

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• I checked there isn't already an issue for the bug I encountered.

Viem Version

2.21

Current Behavior

hi, I am trying to build prove withdraw for optim -> eth bridge tx. here is my code

const { createPublicClient, createWalletClient, custom, http  } = require('viem') 



const { privateKeyToAccount } =  require('viem/accounts')
const { mainnet, optimism } = require('viem/chains')
const { publicActionsL1, publicActionsL2, walletActionsL1, getWithdrawals  } = require('viem/op-stack')


...

const publicClientL1 = createPublicClient({
    chain: mainnet,
    transport: http(gethrpc)
  }).extend(publicActionsL1())



const walletClientL1 = createWalletClient({
    chain: mainnet,
    transport: http(gethrpc)
  }).extend(walletActionsL1())

  
  
const publicClientL2 = createPublicClient({
    chain: optimism,
    transport: http(optimrpc)
  }).extend(publicActionsL2())


const account = privateKeyToAccount("0x" + walletPrivateKey)


const args = process.argv.slice(1)

txhash = args[1]





// console.log(txhash)
const execute = async (txhash) => {

    const receipt = await publicClientL2.getTransactionReceipt({
        hash: txhash,
      })
    
    // console.log(receipt)

    const withdrawal = getWithdrawals(receipt)
    // console.log(withdrawal)
    
    const output = await publicClientL1.getL2Output({
        l2BlockNumber: receipt.blockNumber,
        targetChain: optimism,
      })

    // console.log(output)
    
    const args = await publicClientL2.buildProveWithdrawal({
        account ,
        output,
        withdrawal,
      })
       
    console.log(args)

}


execute(txhash).then((returndata) => {

    console.log(returndata);

  }

    
).catch(err => {
    console.error("err", err);
  }).finally(_ => {
    process.exit(0);
})

and it gives me this error

err TypeError: Cannot read properties of undefined (reading 'length')
    at size (/root/node_modules/viem/_cjs/utils/data/size.js:8:18)
    at encodeBytes (/root/node_modules/viem/_cjs/utils/abi/encodeAbiParameters.js:140:42)
    at prepareParam (/root/node_modules/viem/_cjs/utils/abi/encodeAbiParameters.js:64:16)
    at prepareParams (/root/node_modules/viem/_cjs/utils/abi/encodeAbiParameters.js:34:29)
    at encodeAbiParameters (/root/node_modules/viem/_cjs/utils/abi/encodeAbiParameters.js:22:28)
    at getWithdrawalHashStorageSlot (/root/node_modules/viem/_cjs/op-stack/utils/getWithdrawalHashStorageSlot.js:7:67)
    at buildProveWithdrawal (/root/node_modules/viem/_cjs/op-stack/actions/buildProveWithdrawal.js:17:85)
    at Object.buildProveWithdrawal (/root/node_modules/viem/_cjs/op-stack/decorators/publicL2.js:20:96)

Any idea why? I think I follow the exact same code in the doc.

Expected Behavior

No response

Steps To Reproduce

No response

Link to Minimal Reproducible Example

No response

Anything else?

No response

[github-actions]

Hello @qiushui777.

Please provide a minimal reproduction using StackBlitz, TypeScript Playground (for type issues), or a separate minimal GitHub repository.

Minimal reproductions are required as they save us a lot of time reproducing your config/environment and issue, and allow us to help you faster.

Once a minimal reproduction is added, a team member will confirm it works, then re-open the issue.

[github-actions]

This issue has been locked since it has been closed for more than 14 days.

If you found a concrete bug or regression related to it, please open a new bug report with a reproduction against the latest Viem version. If you have any questions or comments you can create a new discussion thread.