Error Creating a new Web Application

When you're creating a new web application, you may encounter the following error:

New-SPWebApplication :  is already routed to the Default zone of another application. Remove that mapping or use a different URL

Usually this occurs when you have deleted a web application and immediately trying to create another web application with the same name.  The timer service has not had a chance to execute the admin jobs to clear out all the settings in the configuration database.

To expedite the timer job you can run this PowerShell command:

Stop-Service -Name SPAdminV4

Start-Service -Name SPAdminV4

Start-SPAdminJob -Verbose



Reference:  Start-SPAdminJob