Error: bad secret key size , DEPLOY LOOM TESTNET

[ThuyKim97]

I try to deploy on Loom testnet. THis is my configtion of Loom in config-truffle.js

loom_testnet: {
provider: function() {
const privateKey = 'YOUR_PRIVATE_KEY';
const chainId = 'extdev-plasma-us1';
const writeUrl = 'wss://extdev-basechain-us1.dappchains.com/websocket';
const readUrl = 'wss://extdev-basechain-us1.dappchains.com/queryws';
return new LoomTruffleProvider(chainId, writeUrl, readUrl, privateKey);
},
network_id: 'extdev'
},

AND I got this ERROR
Error: bad secret key size
at Function.nacl.sign.keyPair.fromSecretKey (C:\Users\LENOVO\node_modules\loom-js\node_modules\tweetnacl\nacl-fast.js:2320:11)
at publicKeyFromPrivateKey (C:\Users\LENOVO\node_modules\loom-js\src\crypto-utils.ts:69:34)
at C:\Users\LENOVO\node_modules\loom-js\src\loom-provider.ts:205:48
at Array.forEach ()
at LoomProvider.addAccounts (C:\Users\LENOVO\node_modules\loom-js\src\loom-provider.ts:204:24)
at new LoomProvider (C:\Users\LENOVO\node_modules\loom-js\src\loom-provider.ts:193:10)
at new TruffleLoomProvider (C:\Users\LENOVO\node_modules\loom-truffle-provider\src\index.ts:22:20)
at Object.provider (C:\Users\LENOVO\Documents\Web3\truffle-config.js:124:16)
at Object.getProvider (C:\Users\LENOVO\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\provider\index.js:20:1)
at Object.create (C:\Users\LENOVO\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\provider\index.js:13:1)
at TruffleConfig.get [as provider] (C:\Users\LENOVO\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\config\dist\configDefaults.js:276:1)
at Object.detect (C:\Users\LENOVO\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\environment\environment.js:19:1)
at Object.module.exports [as run] (C:\Users\LENOVO\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\core\lib\commands\test\run.js:37:1)
at runCommand (C:\Users\LENOVO\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\core\lib\command-utils.js:297:1)
Truffle v5.11.5 (core: 5.11.5)
Node v20.14.0