This can happen if you try to open a project created originally in Logic 4, 5, or 6, which you subsequently opened and saved in Logic Pro 7, 8, or 9. Here’s how to work with these projects in the most recent versions of Logic Pro:
- If you haven't done so already, open the project in Logic Pro 10 or later, save the project, then close it.
- Create a new empty Logic Pro project.
- Choose File > Import > Logic Projects, select the older project that you saved, then click Import. All the tracks in the older project appear in the browser on the right side of the Logic Pro main window.
- For each audio or instrument track you want to add to the new project, select the Content checkbox. To select all tracks, including aux and output tracks, press Command–A, then select one track’s checkbox.
- Click any other parameters you want to import into the new project except for I/O settings.
- Click Add at the bottom of the browser.
Selected tracks are added to the Tracks area, along with the other parameters you selected in the browser.