Hi, In addition to my message I want you to see the modifications I had to made. 
Open this webpage:
https://overpass-api.de/achavi/?changeset=151062619
Red lined objects a. re my modifications.
In a number of times you mapped empty pieces of ground or a courtyard.
For a beginner mapper is this task a bit to difficult. Look after easier task if I might advise you.
Best regards