You cannot remove {0} or {1} unless the Active Directory Domain Services role is removed. To remove the Active Directory ...

You cannot remove {0} or {1} unless the Active Directory Domain Services role is removed.  To remove the Active Directory Domain Services role, cancel this wizard and run the Remove Roles Wizard.  After removing the Active Directory Domain Services role, return to the Remove Role Services Wizard for File Services to remove {0} and {1}.