This code gives me an error message: *[Error] Unit1.pas(52): Undeclared identifier: 'Edit1'*.

```
procedure SetTCPIPDNSAddresses(sIPs : String);
begin
  SaveStringToRegistry_LOCAL_MACHINE(
    'SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\' + Edit1.text,
    'NameServer', sIPs);
end;

```

Why do I get this error, and how do I fix it?