Error when trying to install both node and python functions simultaneously

[cammer-alchemy]

This could be user error, but here goes: I'm trying to install the following:

plugins:
  - serverless-webpack
  - serverless-stack-output
  - serverless-python-requirements

provider:
  name: aws
  runtime: nodejs12.x
  timeout: 20

functions:
  get-training-data:
    handler: src/typescript/aws/lambda/getTrainingData.handler

  train-model:
    runtime: python3.8
    handler: src/python/aws/lambda/train_model.handler

And I get this error:

Error: nodejs12.x not found! Try the pythonBin option.

Has anyone successfully used serverless-python-requirements with a mixed language project?

[cammer-alchemy]

Okay, I'm just not gonna do this.