Sending a float to an incompatible type id parameter

I'm in the middle of creating a button that uses kernel data to store the name, xCoordinate and yCoordinate of the dot annotation. I can save the name successfully, but I keep getting this error when I try to save the coordinate. I wrote down the correct data, I just can't save it.

When I try to setValue for newPOI, I get the error: Sending 'float' to parameter of incompatible type 'id'.

In the data model, the attribute is float. self.latitude and self.longitude are float types.

My method is a bit rough because I'm relatively new to this, but I would appreciate any feedback you can give me about the bug. Below is my code for the method. I don't understand where "id" is playing here.

-(void) saveSelectedPoiName:(NSString *)name withY:(float)yCoordinate withX:(float)xCoordinate{
    self.pointFromMapView = [[MKPointAnnotation alloc] init];
    self.annotationTitleFromMapView = [[NSString alloc] init];

    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
    NSManagedObjectContext *context = [appDelegate managedObjectContext];

    self.annotationTitleFromMapView = name;
    self.latitude = yCoordinate;
    self.longitude = xCoordinate;

    NSEntityDescription *entityPOI = [NSEntityDescription entityForName:@"POI" inManagedObjectContext:context];
    NSManagedObject *newPoi = [[NSManagedObject alloc] initWithEntity:entityPOI insertIntoManagedObjectContext:context];
    //create new POI record
    [newPoi setValue:name forKey:@"name"];
    [newPoi setValue:yCoordinate forKey:@"yCoordinate"]; <---error happens here for yCoordinate.

    NSError *saveError = nil;

    if (![newPoi.managedObjectContext save:&saveError]) {
        NSLog(@"Unable to save managed object");
        NSLog(@"%@, %@", saveError, saveError.localizedDescription);
    }
}