An object of the type Microsoft.SharePoint.Administration.SPIisWebServiceApplicationPool named "User Profile Service App Pool" already exists under the parent Microsoft.SharePoint.Administration.SPIisWebServiceSettings named "SharePoint Web Services". Rename your object or delete the existing object.".
So I search for the resolution of the issue. I got two options
1. They say Try a different name. - Which didn't help in my case.I would say try your luck also.
2. Delete current app pool and try again to create.
So here is the process:
IIS will not provide the interface for managing service application's application pools. But we can delete service application's application pool in SharePoint 2010/2013 using powershell.
Use these below cmd-let to get list of service application's application pools.
SharePoint 2010/2013 delete orphaned application pool: To delete a application pool of service application, use the cmdlet: