I have a simple _hello world_ contract, compiled with Vyper.  I use Web3j CLI to make a Java wrapper class from the contract's abi and bin files. When I deploy it, I get a `stack underflow` error.

- I know the Vyper contract works, because I successfully deployed it with Truffle.  
- I know my Web3j project is okay, because it can successfully deploy a Solidity _hello world_ contract.



**QUESTION: Why can't Web3j deploy a simple Vyper contract?**

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The Ganache Error:
`{"error":"stack underflow","program_counter":1,"return":"0x"}`

Vyper compile commands:

    vyper -f abi -o hello.abi hello.vy
    vyper -f bytecode -o hello.bin hello.vy

Versions:
- Ganache CLI v6.12.2 (ganache-core: 2.13.2)
- Web3j 4.9.6
- Vyper 0.3.7

Let me know if you want any other details.  Thanks