See tips from David and Matthew here - displaying one story at a time until you find the story with the problem library part, then using the marquee to divide the story in half, then half again, etc until you locate the issue:
http://archicad-talk.graphisoft.com/viewtopic.php?t=22693
After this 'divide and conquer' approach to finding the problem door, you probably will only need to review the door parameters to find the issue - not actually look at any lines in the script. There is likely a fill that reads as "Missing" or something like that.
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