iOS 12. OnDemand resources return NSCocoaErrorDomain Code=4097 "connection to service named com.apple.ondemand.client"

Question

Has anyone encountered this error? What is the reason for this?

My resource named "Tag" contained in "Prefetched" and "Download Only On Demand".

XCode 10 (10A255), iOS 12, IPhone 6 Plus.

My code:

NSSet *tags = [NSSet setWithObjects:@"Tag", nil];
NSBundleResourceRequest *request = [[NSBundleResourceRequest alloc] initWithTags:tags];

[request conditionallyBeginAccessingResourcesWithCompletionHandler:^(BOOL resourcesAvailable) {
    if (resourcesAvailable)
    {
        /* some actions */
        [request endAccessingResources];
    }
    else
    {
        [request beginAccessingResourcesWithCompletionHandler:^(NSError * _Nullable error) {
            if (error)
            {
                NSLog(@"%@", error);
            }
            /* some actions */
            [request endAccessingResources];
        }];
    }
}];