Unable to deploy Python Lambda + virtualenv

Serverless Framework
1

Hello everyone, I am trying to deploy a Python Lambda created inside a virtualenv.
If I run the Lambda in local everything is working fine, but when I try to deploy the lambda in AWS, I am getting this error:

[ERROR] Runtime.ImportModuleError: Unable to import module 'puller': No module named 'raindropio'
Traceback (most recent call last):

I tried almost every combination of the plugin, but I am not figuring out a solution. This is my serverless.yml section:

plugins:
  - serverless-python-requirements

custom:
  pythonRequirements:
    dockerizePip: non-linux
    zip: true
    slim: true
    fileName: requirements.txt

I checked on previous posts and I saw that other users are reporting the same problem.