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 won't Web3j deploy a simple Vyper contract?

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