What happens if you unload the Office Library and use only the ARCHICAD default Library? Does the error happen then, too, when trying to create or edit Library Parts?
If the answer is NO, it means the message comes only when the Office Library is loaded, so the error is in your Office Library.
From the name of the JPG I suppose you have some Andersen Windows and they use these JPG files, which are now somehow missing.
I can imagine that you have a MASTER_GDL file in your Office Library, which defines Materials, and part of that Material definition is the Texture file to use. So the Material definition is looking for this specific GDL file but cannot find it as it is not located in the Office Library.
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