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Editorial Team
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Asked: 2026-05-26T11:00:33+00:00

I have document based application. It worked fine until I decided to change data

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I have document based application. It worked fine until I decided to change data model. Now I get error when click on Save or Save As

*** Assertion failure in -[NSSavePanel setNameFieldStringValue:], /SourceCache/AppKit/AppKit-1127.1/Nav.subproj/NSSavePanel.m:1622
Invalid parameter not satisfying: value != nil

The strange thing is that error occurs not in my code – I have override method prepareSavePanel: in my NSPersistentDocument subclass but program does not reach this point. Error occurs somewhere between writableTypesForSaveOperation: and prepareSavePanel: (according to saving steps scheme)

Have you got any ideas?

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1 Answer

  1. Editorial Team

    I found the problem.
    In my NSPersistentDocument subclass I have override displayName method and in some cases it returned nil value.
    After fixing it all works fine.

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