PyCharm Pro shows: "This run configuration is unavailable in the free mode and cannot be run"

Problem

PyCharm Pro license is enabled but can't create or access existing run/debug configs with This run configuration is unavailable in the free mode and cannot be run

Cause

This issue could be caused by accidentally disabling the necessary bundled Python plugin which is required for Pro functionalities.

Resolution

To resolve this issue, please follow these steps:

1. Navigate to File | Settings | Plugins

2. Ensure the Python plugin is enabled.

3. Restart the IDE;