How to delete my mac app's savedstate data?

I suspect that my mac app's savedstate data is over full. I've been doing a great many launches of my mac application which involves creating new files, then breaking back to Xcode. Now a stable compiled version and a later version launched from inside Xcode both crash. The Xcode crashes are preceded by NSDocumentController calls that include the suggestive phrase: "... makeDocumentForURL:withContentsOfURL:alternateContent...". As this occurs before control is given to my code, it must be part of document-based app's launch activity. The only thing I can see to do is to delete the app's savedstate data.

How do I delete this savedstate data? The instructions on the web are out-of-date.
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How to delete my mac app's savedstate data?
 
 
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