Slide Show and VB Error

[Nadia]

Hello all,

I am working on a prototype. I have it so that when the
user clicks on the Save command button, a msgbox should
display and then take the user to a different slide.

Yet, when I run it, I get the following error:
"Run Time error '-2147188160 (80048240):
Prensentation (unknown member): Invalid Request. There is
currently no slide show view for this presentation."

I am not sure what this error means. I can get it to work
when I specify nextslide and not the actual slide number.

Here is my code:
Private Sub cmdSubmit_Click()
MsgBox ("Your information has been saved")
ActivePresentation.SlideShowWindow.View.GotoSlide (8)

Thanks in advance for your help!
Nadia