[RESOLVED] Can't Assign to Array please help :((

[deviance]

Private Sub Command1_Click()
Dim a As String, i As Long
Dim b() As String
For i = 1 To 15
a = "test" & i
b = join(a, "# ") '<<<< Can't Assign to Array
Next
MsgBox b
End Sub

please help I can not merge