Well, this error happened about 15 days ago and it wasn't clear what is the reason till Apple released the Xcode update the same day and everything went smooth after that. Again, today I get the same message though I tried to upload the same builds for an app which I submitted 8 days ago. I think we have just to wait for a few hours and see what will happen.
EDIT: Here is a link to show people complain about it at that time and how it was solved without doing anything: LINK
UPDATE: For anyone who uses PlayHaven ads, this may be helpful to avoid this error. Comment the 2 following sections:
In the file PHAdRequest.m (Lines 35-44)
/* if (![PHAPIRequest optOutStatus] && [ASIdentifierManager class])
{
NSUUID *uuid = [[ASIdentifierManager sharedManager] advertisingIdentifier];
NSString *uuidString = [uuid UUIDString];
if (0 < [uuidString length])
{
theIdentifiers[@"ifa"] = uuidString;
}
}*/
In PHAPIRequest.m (Lines 379-383):
/* if ([ASIdentifierManager class])
{
NSNumber *trackingEnabled = [NSNumber numberWithBool:[[ASIdentifierManager sharedManager] isAdvertisingTrackingEnabled]];
[combinedParams setValue:trackingEnabled forKey:@"tracking"];
}*/
This is a temporary workaround till PlayHaven updates their SDK.