Refresh schedule and priority task

Hi all,

I set the schedule to extract data after mid night at 1:00AM for five data source. But It is failed to refresh.

I just noticed that one data source I set the priority 1, and other fours I set all the same number 50. Is it because of the priority task number or other issue? would you have any idea or suggestion, please let me know.

Thanks,

Vanndy