Uncheck a Check Box using VBA

Hi
I have a code which I am trying to use to uncheck a check box but keep getting the error "Unable to get the CheckBoxes property of Worksheet class"

Can anyone help?

 Sub Checkbox_Uncheck()

    Dim Response As VbMsgBoxResult
      
    If Range("A1") = True Then
        Response = MsgBox("Have you cleared all queries allocated to you?", vbQuestion + vbYesNo)
        If Response = vbNo Then
            MsgBox "Please clear all queries before you sign off.", vbInformation
            Sheets("Sheet1").CheckBoxes("Checkbox1").Value = False
        Else
            'Call Reload_financials
        End If
    Else
    End If

End Sub