I can see that it's using the regular KiXforms, not KiXforms.Net.
However in the helpfile I have "Frame" is also not listed as a member of the Form class.
The code itself seems sound, I can't detect a missing bracket or quotation mark.

So to me it seems the error is related to the "Frame" member that does not exist when you call it with $Form.Frame.
Maybe someone else can shed more light on this.

Update, I've tested the simple code:
 Code:
$Form = CreateObject("Kixtart.Form")
? @SERROR
$InfoFrame = $Form.Frame("Informatie", 250,5,240,120)
? @SERROR

This seems to work fine so that indicated that the "Frame" part does indeed work.
I'll need more time to sift through the entire code.

Edited by Arend_ (2016-12-14 12:55 PM)
Edit Reason: Updated post