Vyper plugin not work when compiling smart contract

[afeiluo]

when I compiling it says "KeyError: 'combined_json", I cannot figure out what's wrong with it
https://vyper.readthedocs.io/en/v0.1.0-beta.10/compiling-a-contract.html shows '-f' option can specify output format , how can i config the same option in hardhat.config.js

[fvictorio]

Hi @afeiluo. I'm not sure where that error comes from, but just in case: this doesn't seem to happen with the latest vyper version (0.2.12). I'm not familiar with vyper so I don't know how old 0.1.0b4 is and if it makes sense for us to support it.