Adding Subaccounts after client initialisation

[Arul131]

Bug Description
When trying to create a subaccount with my wallet, I receive an error despite having sufficient SOL balance. I have attached a screenshot of my code for reference. Please review and assist in resolving the issue.
Screenshots
not able to add screenshots,
consoled everything:

🔹 Checking Wallet Connection...
newDrift.js:269 ✅ Wallet Ready. Initializing Drift Client...
newDrift.js:161 ✅ Wallet connected: 6jtiTE5RavgbU11YaR7Yfyy17uKVoAfZZ2FqoSUUNLWL
newDrift.js:183 ✅ Drift Client Initialized
newDrift.js:245 💰 SOL Balance: 1 SOL
newDrift.js:191 🔹 Checking for existing user accounts...
newDrift.js:197 🚀 No accounts found, initializing user account...
newDrift.js:215 ✅ Wallet connected. Initializing user account...

getting this error:
newDrift.js:234 ❌ Error initializing user account: TypeError: Cannot read properties of undefined (reading 'slice')
at sign (index.browser.esm.js:145:121)
at VersionedTransaction.sign (index.browser.esm.js:2176:38)
at RetryTxSender.sendVersionedTransaction (baseTxSender.js:73:16)
at DriftClient.sendTransaction (driftClient.js:4906:34)
at DriftClient.initializeUserAccount (driftClient.js:574:38)
at async initializeUserAccount (newDrift.js:230:40)
at async initDriftClient (newDrift.js:199:9)
at async handleSubscribe (newDrift.js:270:5)

here the code :
try {
console.log("✅ Wallet connected. Initializing user account...");

    // Ensure driftClient is initialized
    if (!client) {
        console.error("❌ Drift Client is not initialized!");
        return;
    }

    // Debugging: Check signTransaction function
    if (!signTransaction) {
        console.error("❌ signTransaction function is missing!");
        return;
    }

    // Initialize user account
    const [txSig, userPublicKey] = await client.initializeUserAccount(0, "TestAccount");

    console.log("✅ User initialized:", userPublicKey.toBase58(), "Tx:", txSig);
} catch (error) {
    console.error("❌ Error initializing user account:", error);
}

};

Browser (please complete the following information):

• Browser [ chrome]

Last upstream Slate commit (run git log --author="\(Robert Lord\)\|\(Matthew Peveler\)\|\(Mike Ralphson\)" | head -n 1):
Put the commit hash here

[wphan]

how do you initialize DriftClient? you may need to initialize it with wallet set to the user creating the subaccount