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NSMigrationMissingSourceModelError, and now I can't set the current model version
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NSMigrationMissingSourceModelError, and now I can't set the current model version


  • Subject: NSMigrationMissingSourceModelError, and now I can't set the current model version
  • From: Daniel DeCovnick <email@hidden>
  • Date: Wed, 08 Jul 2009 14:47:44 -0700

I'm trying to do a Core Data migration. I've got my .xcmappingmodel, I've created a new version of the MOM, and both are under the same xcdatamodeld. When I launch my application, I get the following error: "Persistant store migration failed, missing source managed object model." A little googling revealed that it's the error in the subject. Clearly I have something misconfigured, but I can't figure out what. I've tried various combinations of checking the "target" box, and that does nothing. Somewhere in those attempts, I apparently lost the ability to set the current model version to the new one; if I try, the check mark goes away from the old one, but doesn't appear on the new one.

Any help would be very, very much appreciated.

-Daniel
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