iphone - Classic CoreData error -

I get this classic error:

used to open the store Model

  NSManagedObjectContext * context = [[AppDelegate *] [[UIApplication ShareApp]   
 Rep] Managed Object Contex]; NSManagedObject * newShot = [NSEntityDescription insertNewObjectForEntityForName: Managed object contexts in "shotName": context]; NSString * newName = @ "test"; [New shot setname: new name];  

And how it's made:

Not only do I have an accident with the above message, I am also getting this warning:

'NSManagedObject' can not be answered by'setName: ':'

Obviously something is wrong I think I am using string on both sides.

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Edit, I am now using it after Imant's comment:

  NSManagedObjectContext * context = [[AppDelegate *] [[UIApplication shared applicant ] Rep] Managed Object Contex]; NSManagedObject * newShot = [NSEntityDescription insertNewObjectForEntityForName: Managed object contexts in "shotName": context]; NSString * newName = @ "test"; [New shot set value: newname for: @ "shot number"]; [Reference prevention];  

But I'm still getting:

'NSManagedObjectContext' can not answer '-saveAction'

Use setValue: forKey:

UPDATE

NSManagedObjectContext has the Saving method, not the save code . Therefore:

  NSError * error = zero; [Save the reference: & amp; Error] if (error) {[NSAPP present error: error]; Return; }