last week I ran the segment advisor in enterprise manager as shown in the picture(attached). Since I ran it, I kept getting errors in workflow list. Do you think it is due to this segment adivsor?
No. It is not related with what you do with the enterprise manager.
Check this note:
Error Notifications Received From IGS_PE_WF_GEN Workflows (Doc ID 1902783.1)
Also this note:
Receipt Workbench Error: Applying Receipt Generates Workflow Notification With Error - Local Event Error: oracle.apps.ar.applications.cashapp.apply (Doc ID 973074.1)