CTD when saving airport

When I first got into developing airports a month or two ago when I wanted to fix Auckland Airport. Every time I would save the project (the save part in the top right hand corner…) The thing would CTD… I don’t know what I did, but it stopped doing it…?? I haven’t made another airport for a while and while having a desire to develop another airport since this new update for the SDK has been released, I have noticed now that when I save, build etc I have started getting these CTD now.
What was the issue that I might have unknowingly stumbled on and what can I do to stop the CTD?

If you built it with the previous SDK the most common bug came from copying items in SDK 11, or 10 or whatever. Previous versions didn’t note a copy.

That version added ‘copy’ to each iteration so if you did it over and over again the item name would display as - copy copy copy copy copy etc

The latest version changed that. Open up your project xml with notepad ++ and see if you still have the copy thing in there.

That tended to cause crashes when opening rather than saving but that’s the most obvious one to check first.