About a function in openstaad - "RemovePropertyFromUPTTable"

Hi, everyone,

I want to use Openstaad API to manipulate user provided table in staadpro,  I already succesfully added UPT table 1 and  several sections by functions: " CreateUPTTableEx"  and "AddUPTPropertyISECTION", but , when I try to delete the first seciton of UPT table 1.  it  fails, and there is no error/warning  message. anyone can tell me where is wrong?

thank you

Below is the test code in EXCEL vba.

Private Sub Cmd_Test_PROPERTY_Click()

Dim oSTD As Object

Set oSTD = GetObject(, "StaadPro.OpenSTAAD")

oSTD.Property.RemovePropertyFromUPTTable 1,1

Set oSTD = Nothing

End Sub