iOS Question app in background from home button

hi, i make app whit hhtjob, when i push home button the app in log is alive and scroll this app in background, after one or two minutes this app end of use job and cannot receive new data from server via http, in log receive this error: Can't endBackgroundTask: no background task exists with identifier 16d358, or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug.
one help? is a debug this problem?