objective c - Bad Access error in Thread with a managed object in iOS -


I have a line of code that has a table in my esclaim DB: 

  User * user = [[allocated user] init]; ... do some processing in one thread and other stuff) // And Function   
 But I commented all the users * except the line of users and I came to know that my error was that line I came to the end of the function call. The error is:  
  "Thread X: EXC_BAD_ACCESS (code = 1, address = XXXXX)   
 Why does this happen?   
 
 
 You can not create with  NSManagedObject  example  init  Code> NSManagedObject  is associated with a  NSManagedObjectContext  and should be created using:  initWithEntity: insertIntoManagedObjectContext: .

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