VBA excel 2007, ComboBox "Permission Denied" - vba

Question

I'm a beginner with VBA, I'm developing a macro on excel 2007 and I'm having some problems with the ComboBox. Anywhere I try to add items i always get the error 70 "Permission Denied". What is my mistake?
Below you can find my simple code
Private Sub CommandButton2_Click()
Dim pic As IPictureDisp
Set pic = UserForm1.Image1.Picture
'stdole.SavePicture pic, "ciao"
Call SavePicture(pic, "ciao.jpg")
End Sub
Private Sub CommandButton3_Click()
Dim MyChart As Chart
Dim ChartData As Range
Dim ChartName As String
ChartName = "ANCONA"
Set ChartData = ActiveSheet.Range("A1:A9")
Application.ScreenUpdating = True
'UserForm1.Image4.Picture = LoadPicture("C:\Users\rfori\Desktop\PROGETTO
MARTINA\parto_trig.jpg")
'
Set MyChart = ActiveSheet.Shapes.AddChart(xlXYScatterLines).Chart
With MyChart.SeriesCollection.NewSeries
.Name = ChartName
.Values = ChartData
.XValues = ActiveSheet.Range("B1:B9")
End With
Dim imageName As String
imageName = "prova.jpg"
MyChart.Export Filename:=imageName, FilterName:="jpg"
Application.ScreenUpdating = True
UserForm1.Image1.Picture = LoadPicture("prova.jpg")
'MyChart.SeriesCollection(1).Name = ChartName
'MyChart.SetSourceData Source:=ChartData
End Sub
Private Sub UserForm_Activate()
ComboBox1.AddItem "ciao"
End Sub
Private Sub UserForm_Initialize()
ComboBox1.AddItem "ciao"
With Me
.StartUpPosition = 1
.Width = MultiPage1.Width
.Height = MultiPage1.Height
.Left = Application.Left - (Application.Width * 0.85) \ 2
.Top = Application.Top - (Application.Height * 0.85) \ 2
End With
myarray1 = Array("Ancona", "Milano", "Palermo")
For x = 0 To 2
'ComboBox1.AddItem myarray1(x)
Next x
End Sub
Sub window_sizer()
With ActiveWindow
.WindowState = xlNormal`enter code here`
.Height = 75
.Width = 125
.ScrollColumn = 1
.ScrollRow = 1
End Sub
Thank you in advance

Answer 1

had the same problem before as described in Combobox additem permission denied error no.70
.
Make sure that the property ListFillRange is empty.