Hi Balajee,
From workflow log it is clear that workflow is in error, need to get inside and find out out what is causing the issue. There can be various reasons like user profile doesn't have mail id or master data update.Take the help of a workflow consultant to analyze it in detail.
And also, the thread is named as 'workflow not triggering' and workflow log is attached. Can you explain the issue in detail.
Regards,
Rahul