If the feed is syncing, you can’t do the task scan, if you want to check the feed is syncing or not you can check it on feed status on web interface, if it is syncing you will see a banner that alert you can’t scan until the feed finished syncing, and each member of feed will have a column called status, it will have something like “updating…”. And after you sync successfully, it will be display “current” at the status column. My image is my feed, but i synced 2 days ago and i don’t open internet to auto sync