What would cause persistentStoreForURL: to return nil?

[Gideon King]

I know that the URL is valid and it's readable. I can open the file in my 
application. I can read it into an NSData with dataWithContentsOfURL: 

The purpose of what I am doing is trying to migrate to an XML store to see if 
that will help me isolate the problem I am having with "save as", which I 
posted about before.

Here's what I do in my test in my persistent document:

        NSPersistentStoreCoordinator *psc = [[self managedObjectContext] 
persistentStoreCoordinator];
        NSURL *oldURL = [NSURL 
fileURLWithPath:@"/Users/gideon/Development/TestNMDocs/Untitled11.nm5"];
        NSURL *newURL = [NSURL 
fileURLWithPath:@"/Users/gideon/Development/TestNMDocs/Untitled11.xml"];

        NSError *error;
        NSPersistentStore *myStore = [psc persistentStoreForURL:oldURL];
        NSPersistentStore *xmlStore = [psc migratePersistentStore:myStore
                                                                                
                            toURL:newURL
                                                                                
                          options:nil
                                                                                
                         withType:NSXMLStoreType
                                                                                
                            error:&error];

oldURL is verifiably present, readable and valid, but myStore is always nil.

Any ideas?

Thanks

Gideon_______________________________________________

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