momo:
Two options:
1. Install the missing library on your home computer, and use the
Library Manager to add it to your project.
2. Save As... an Archive file that will include all used library parts, see the Help files: Configuration > Archive Files.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
David