This can't work because it used slacker, which is deprecated: "This repository is archived and will not receive any updates
It's time to say goodbye. I'm archiving Slacker. It's been getting harder to find time to maintain this project for a while now. For years it's been the most popular Python library for Slack. Eventually Slack decided to go with their library, and I lost my motivation to maintain it. Thank you all for your contributions to this project." https://github.com/os/slacker
This can't work because it used slacker, which is deprecated: "This repository is archived and will not receive any updates It's time to say goodbye. I'm archiving Slacker. It's been getting harder to find time to maintain this project for a while now. For years it's been the most popular Python library for Slack. Eventually Slack decided to go with their library, and I lost my motivation to maintain it. Thank you all for your contributions to this project." https://github.com/os/slacker
It would need to migrate to the following library to work: https://github.com/slackapi/python-slack-sdk