The Active Directory needs to be prepared for Exchange Server and Ldifde.exe is not installed on this computer. You must ...

The Active Directory needs to be prepared for Exchange Server and Ldifde.exe is not installed on this computer. You must install Ldifde.exe by opening Windows Powershell, running 'Import-Module ServerManager', then running 'Add-WindowsFeature RSAT-ADDS'. Alternately you can restart setup on a domain controller.