Not all the adafruit parts are entirely correct. Most are in pretty good shape, but some have problems. Part making in general is complex. These two tutorials apply to current versions of Fritzing (many of the others are from older versions) and may help you. Mine includes a reference to FriztingCheckPart.py which is where the error messages come from. It does require that you understand the underlying xml (as that is all it has to work with) to interpret them though which isn’t always easy.
I lately learned there aren’t links to the videos in Old_Grey’s tutorial so you need to do a google search for the title and then they come up on YouTube.
edit:
I am also happy to answer questions for people interested in making parts as we need more people capable of making parts …
Peter