SOLVED: Final Cut Pro cannot save changes to: The storage location for one or more...
Ok, I've solved how to get past the error popup "Final Cut Pro cannot save changes to "Library File Name": The storage location for one or more libraries is no longer available. The libraries will be closed so that no work is lost." The solution to this problem is done two ways.
One way is to reset your preferences that may have been corrupted (I explain in the video), the other solution is to start a new library, event, project (I show it in the video) which will let you finish your editing.
It also may say: "Final Cut Pro cannot save changes to projects or Events. The disk where your projects or Events are located maybe full or unavailable, projects or Events may have moved or permissions may have changed. To avoid losing your work, quit FCP"
I'm so glad I could fix this and finish editing my final cut pro x project.