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I’m having trouble activating the cell that was found.
The code is as follows::
Private Sub cmdPesquisar_Click()
    'Verificar se foi digitado um nome na primeira caixa de texto
    If Txtnif.Text = "" Then
        MsgBox "Digite o NIF de um cliente"
        Txtnif.SetFocus
        GoTo Linha1
    End If
    With Worksheets("Central.de.Clientes").Range("F:F")
        Set c = .Find(Txtnif.Value, LookIn:=xlValues, LookAt:=xlPart)
        If Not c Is Nothing Then
            c.Activate
            Txtnif.Value = c.Value
            Txtempresa.Value = c.Offset(0, -1).Value
            Txttelefone.Value = c.Offset(0, 1).Value
            Txtmorada.Value = c.Offset(0, 2).Value
            Txtlocal.Value = c.Offset(0, 3).Value
            Txtcontacto.Value = c.Offset(0, 4).Value
            Txtemailrel.Value = c.Offset(0, 5).Value
            Txtemailfact.Value = c.Offset(0, 6).Value
            'Carregando o botão de opção
            If c.Offset(0, 8) = "Masculino" Then
                OptionButton1.Value = True
            Else
                OptionButton2.Value = True
            End If
        Else
            MsgBox "Cliente não encontrado!"
        End If
    End With
    Linha1:
End Sub
But when I run, the following error appears:

And the debug identifies the line:
c.Activate
Can help me identify the error in the code?
In a quick test, the code works for me. It can be the way you are declaring variables, what type of variable is
Txtnif(Texbox? Combobox? Cell? )? And addOption Explicitin the code header, which is considered good practice, as you will need to declare all variables correctly. And this way you are only finding the first of this value, try using the example of the . Find method– danieltakeshi
Are you selecting another sheet at the time you perform this function? Add
Worksheets("Central.de.Clientes").Activatebefore the wrong code. Remember that it is recommended to avoid using Activate and Select, but in some cases it may be necessary to use these. Especially if you want to focus on the value found.– danieltakeshi