Context does not save the changes with error 1550

Question

I\'m trying to update an entity and save the changes. I\'m getting always the following error:

The operation couldn’t be completed. (Cocoa error 1550.)
         


        

Answer 1

Explanation:

NSValidationErrorObject= ...

This is the object that you trying to save and validation failed for it

NSValidationErrorKey=invitedUsers

This is the attribute (relationship) that failed validation

NSValidationErrorValue=Relationship 'invitedUsers' on managed object (0x11024aa0)

What failed validation. Everything else is the list of the users in the relationship...

I don't know your object model but for example the following seems to be wrong:

invitedToEvents =     (
        "0x110abbb0 ",
        "0x166c0840 ",
        "0x110abba0 "
    );

Note that one of the events is there twice (it has the same object id).