Server "{2}" already has an OAB virtual directory "{0}" in the Web site "{1}". This OAB virtual directory exists in IIS but ...

Server "{2}" already has an OAB virtual directory "{0}" in the Web site "{1}". This OAB virtual directory exists in IIS but not in Active Directory. Use IIS Manager to remove the OAB virtual directory from IIS, and then use the New-OABVirtualDirectory cmdlet to re-create the virtual directory.