Hi, In my iphone app, Using core data as DB, When i try to change the value of an attribute for 2-3 times in my different module of the application i.e. in different files, it crashes with error No (Cocoa error 133020.) and also listing the cached ROw , with all the new & old version of the particular entry , could any one help me by providing a sample POC for Multiprocess core data APP.