Unable to execute get method. Got exit_code: -13

[mianshenglee]

i'm doing the swap according to the ston doc DEX v2 guide, code like this, any can help?
const client = new TonClient({
endpoint: "https://testnet.toncenter.com/api/v2/jsonRPC",
});

const router = client.open(
DEX.v2_1.Router.create(
"kQALh-JBBIKK7gr0o4AVf9JZnEsFndqO0qTCyT-D-yBsWk0v" // CPI Router v2.1.0
)
);

const proxyTon = pTON.v2_1.create(
"kQACS30DNoUQ7NfApPvzh7eBmSZ9L4ygJ-lkNWtba8TQT-Px" // pTON v2.1.0
);

// swap 1 TON to TestRED but not less than 1 nano TestRED
const txParams = await router.getSwapTonToJettonTxParams({
userWalletAddress: "", // ! replace with your address
proxyTon: proxyTon,
offerAmount: toNano("1"),
askJettonAddress: "kQDLvsZol3juZyOAVG8tWsJntOxeEZWEaWCbbSjYakQpuYN5", // TestRED
minAskAmount: "1",
});

but got error:
G:\workspace\mason\gitee\banban-node-rest-server\node_modules@ton\ton\dist\client\TonClient.js:42
throw Error('Unable to execute get method. Got exit_code: ' + res.exit_code);
^
source-map-support.js:722
Error: Unable to execute get method. Got exit_code: -13
at TonClient.runMethod (G:\workspace\mason\gitee\banban-node-rest-server\node_modules@ton\ton\dist\client\TonClient.js:42:19)
at processTicksAndRejections (node:internal/process/task_queues:95:5)
at async Object.get (G:\workspace\mason\gitee\banban-node-rest-server\node_modules@ton\ton\dist\client\TonClient.js:364:26)
at async JettonMinter.getWalletAddress (G:\workspace\mason\gitee\banban-node-rest-server\node_modules@ston-fi\sdk\src\contracts\core\JettonMinter.ts:12:20)
at async Promise.all (index 1)
at async _class.getSwapJettonToJettonTxParams (G:\workspace\mason\gitee\banban-node-rest-server\node_modules@ston-fi\sdk\src\contracts\dex\v2_1\router\BaseRouterV2_1.ts:199:7)