Hi @Pankaj Singh ,
You need to click on upgrade on process,
See each subtask and what is failed.
Analyse those subtasks error/output.txt
and try to rectify the same.
You will have the option to retry each task and you can retry those tasks once you rectify the errors.
Mostly by searching this community thread you will be able to find solutions for issues you are facing.
Hope this helps.
If you cant please post the relevant error logs of subprocess pending.
Hope this helps you