We are encountering a persistent issue where the Flask module is not being found when trying to deploy a Python Flask application on Render.com. The error we are consistently facing is a “ModuleNotFoundError” for Flask, despite it being installed and the application working as expected locally. The key challenge is ensuring that the dependencies, particularly Flask, are recognized and accessible in the deployment environment on Render.
Local Environment Testing:
The Flask application works perfectly in the local environment. The dependencies are installed and recognized, and the application is running as expected.
Upon deploying to Render.com, we encountered a “ModuleNotFoundError” indicating that Flask is not installed or not found in the expected path.
We tried installing dependencies using a virtual environment and without it. We ensured that the ‘requirements.txt’ file is up to date and the dependencies are installed during the build process.
We modified the PYTHONPATH to include the path where the dependencies are installed. We ensured that this path is explicitly included during the application start command.
We ensured that the Python version is consistent. The user confirmed using Python 3.10.9. We even set the Python version explicitly in the environment variables on Render.
We added logs to print the Python version and sys.path to understand the paths Python is referring to, and to ensure that the correct version of Python is being used.
Despite these efforts, the “ModuleNotFoundError” for Flask persists. The dependencies, especially Flask, appear not to be recognized in the path or the environment where the application is running on Render.com.