[Error: Error coming from Bundler: AA21 didn't pay prefund]

[majedur]

I added smart contract in dashboard .

my code

static createPatientAccount = async (
    patientID: any,
    name: any,
    gender: any,
    age: number,
    location: any,
    birthday: any,
    emailAddress: any,smartAccount:any
  ) => {
    try {
      const contract = await Contract.fetchContract();
      const tx = await contract?.populateTransaction.setPatient(
        BigInt(patientID * 1),
        name,
        gender,
        BigInt(age * 1),
        location,birthday,emailAddress
      );
  
      const tx1 = {
        to: contractAddress,
        data: tx?.data,
      };
      const userOpResponse = await smartAccount.sendTransaction(tx1, {
        paymasterServiceData: { mode: PaymasterMode.ERC20 },
      });
      console.log('userOpResponse',userOpResponse)
    } catch (error) {
      console.log(error)
    }
   
  };

smart wallet config

const smartWallet = await createSmartAccountClient({
                signer: signer,
                biconomyPaymasterApiKey: config.biconomyPaymasterApiKey,
                bundlerUrl: config.bundlerUrl,
                rpcUrl: chains.providerUrl,
                chainId: chains.chainId,
            });