imported projects causing warnings

I have a situation where an imported project is causing the following warning.

I have a few issues

First, is there another way to end the error?

Second, I tried to remove the imported project to end the warning but the project can’t be removed.

Relevant links:

This message shows up when the app host for your project doesn’t match the host for an imported project. The host contains your code components, and we generally want to make sure your project is using the same consistent set of code components no matter which project you’re working in. If the two listed hosts have the same code components registered, then the warning can be safely ignored.

Why couldn’t the imported project be removed?