Trine:
One or more of the fills that the library part wants to use is missing from the ArchiCAD project file, see this thread:
Library Parts Not Working Properly.
Based on your screen shot, this looks like a macro for interior door panels, so check your doors to see if you can find the missing fill, and change it to one of the fills in the project file.
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