@Marvin when I deploy a prefect flow, sometimes it sends a message about the package – e.g. for nltk

It sounds like you're asking about how Prefect handles package dependencies when deploying flows. When you deploy a flow, Prefect needs to ensure that all the necessary packages are available in the environment where the flow runs. If a package like NLTK is used in your flow, Prefect will try to import it. If the package is not installed in the environment, you might see a message or an error about it. If you're seeing a message about a package and you're not sure why, it could be because: 1. The package is used in your flow but not installed in the environment where the flow is running. 2. The package is a dependency of another package that your flow uses. 3. The package is a part of the standard library, but there's an issue with the installation in the environment. To resolve this, you might need to ensure that all necessary packages are installed in the environment where your flow runs. This could involve adding a step to your deployment process to install packages, or using a Docker image that includes all the necessary dependencies. If you're still having trouble, could you provide more details about the message you're seeing? That might help me give a more specific answer.