You will find below error messages in AWI log file.
Exception in thread "main" java.io.IOException:
Failed to create a sub directory for the OSGI configuration under /appdata/Automic/AutomationEngine/bin/configuration
at com.automic.server.startup.Main.getUniqueSubDirectory(Main.java:211)
at com.automic.server.startup.Main.main(Main.java:101)
Automic Web Interface : 12.x
Automation Engine : 12.x
cause: Permission issue
Resolution: Follow below step.
Need to change the permission on the folder C:\AutomationEngine/bin/configuration directory.
Role required: Admin
You need to change the permission because, It is owned by root but it should be owned by your automic user.