On Aug 23, 2010, at 09:33, Ayers, Joseph wrote:

>  NSError *error = nil;
>  if (![[self managedObjectContext] save: &error]) {
>  NSLog(@"Error while saving\n%@",
> ([error localizedDescription] != nil) ? [error localizedDescription]: 
> @"Unknown Error");
> 
> Results in:
> 
> 2010-08-22 20:31:32.385 Roboplasm[3508:a0f] Error while saving
> TapeList is a required value.

The error means that some entity is defined to have a to-one relationship to 
TapeList, and the relationship property is defined to be non-optional, but in 
some object the relationship is actually nil.


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