The selected package cannot be a direct ancestor of the project.

The error message "The selected package cannot be a direct ancestor of the project" suggests that there is an issue with the hierarchical structure of your project dependencies. This can occur when a package is incorrectly set as a parent or ancestor of the project, which is not allowed.

To resolve this, you need to ensure that your project and its dependencies are correctly structured. Here are some relevant sessions from WWDC that might help you understand and fix this issue:

A Swift Tour: Explore Swift’s features and design - This session discusses how to organize code into packages and modules, which might help you understand the correct way to structure your project dependencies.
Demystify explicitly built modules - This session covers how to manage and optimize module builds, which can be useful for understanding how to properly set up your project and its dependencies.

If you need more specific guidance on how to structure your project or manage dependencies, you might want to look into these sessions in more detail.