The paymaster contract does not have enough funds deposited into the EntryPoint contract to cover the required prefund of the user operation.
- Verify that the
paymasterAndDatafield is correct, and that the first 20 bytes are the address of the paymaster contract you intend to use.
- If you are using your own paymaster contract, deposit more funds into the EntryPoint contract through the
deposit()function of the paymaster contract.
- If you are using a paymaster service like Pimlico, reach out to them.