Hi Francis Omotayo,
Please check if there are any errors either in domain log or DIS log.
It would be better if you open a discussion in Data Quality thread instead of DIH to get attention from correct people.
I agree With Pavan to check the logs, most of the time the error is shown there.
Just to make a suggestion,In my case when i encounter this issue the port for dis was already being used. u could check that ofc