err.walk is not a function

[davidlee1435]

Hi all, I'm using Turnkey with Viem and running into an issue when trying to call writeContract. I suspect it's an error with Turnkey and not Viem because I am able to use Viem's privateKeyToAccount to successfully call writeContract.

Here's the part of the TypeScript script that I have that's throwing the error:

  const turnkeyClient = new TurnkeyClient(
    {
      baseUrl: TurnkeyConfig.baseUrl,
    },
    new ApiKeyStamper({
      apiPublicKey: TurnkeyConfig.apiPublicKey,
      apiPrivateKey: process.env.TURNKEY_API_PRIVATE_KEY,
    }),
  );

  const account = await createAccount({
    client: turnkeyClient,
    organizationId: TurnkeyConfig.organizationId,
    privateKeyId: TurnkeyConfig.privateKeyIds.minter,
  });

  const publicClient = createPublicClient({
    chain,
    transport: http(),
  });

  const walletClient = createWalletClient({
    account,
    chain,
    transport: http(),
  });
  
  // This returns a correct response
  const { request } =
    await publicClient.simulateContract({
      account,
      <my address>,
      abi: myErc20ABI,
      functionName: "mint",
      args: [recipient, amount],
    });

  const hash = await walletClient.writeContract(request);

Stack trace:

[Uncaught Error]: err.walk is not a function

TypeError: err.walk is not a function
    at getNodeError (/Users/davidlee/dev/peregrine/stable/packages/scripts/node_modules/viem/utils/errors/getNodeError.ts:36:38)
    at getTransactionError (/Users/davidlee/dev/peregrine/stable/packages/scripts/node_modules/viem/utils/errors/getTransactionError.ts:23:27)
    at sendTransaction (/Users/davidlee/dev/peregrine/stable/packages/scripts/node_modules/viem/actions/wallet/sendTransaction.ts:185:30)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async writeContract (/Users/davidlee/dev/peregrine/stable/packages/scripts/node_modules/viem/actions/wallet/writeContract.ts:133:16)
    at async processCommand (/Users/davidlee/dev/peregrine/stable/packages/scripts/src/mint-usdlr.ts:83:16)

Dependency versions:

"@turnkey/api-key-stamper": "^0.1.1",
"@turnkey/http": "^1.2.0",
"@turnkey/viem": "^0.2.4",
"viem": "^1.11.0"

Let me know if I should add any other information!

[davidlee1435]

After trying to call the same function with @turnkey/ethers, it seems the root cause was because my (misconfigured) policy engine denied my request:

[Uncaught Error]: Failed to sign: Turnkey error 7: policy engine denied request implicitly (Details: [])

TurnkeyActivityError: Failed to sign: Turnkey error 7: policy engine denied request implicitly (Details: [])
    at TurnkeySigner._signTransactionWithErrorWrapping (/Users/davidlee/dev/peregrine/stable/node_modules/@turnkey/ethers/src/index.ts:112:13)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async TurnkeySigner.signTransaction (/Users/davidlee/dev/peregrine/stable/node_modules/@turnkey/ethers/src/index.ts:146:22)

Hope this adds some color for a fix!

[timurnkey]

Glad you were able to find a fix. It looks like the viem API was swallowing the errors because they expect a specific error: BaseError with a method walk(). Will see if there's anything we can do on our side to improve this UX