crash on coredata ios8

Question

I have a crash on CoreData when I save :

2014-09-16 09:51:58.273 My_app[2678:105246] *** Terminating app due to uncaught exception \'NSInvalidArgumentException\         


        

Answer 1

Just to summarize the comments that helped me resolve this issue:

• This seems to be a bug in Core Data related to Ordered Many-to-Many Relationships
• If you have to keep the ordered option, there seems to be a workaround: make the relationship ordered both ways (thanks @Fabio Ritrovato).