Undefined Code Jumps in VBA

I've got a very strange problem ...

I want to copy a region of an excel sheet, and paste it as a new slide in a powerpoint presentation ... that would regularly be achieved by the following code:

Range(sPrintArea).Copy
Set ppShapeRange = ppSlide.Shapes.Paste

BUT:

While executing the second command (paste) VBA jumps to a totally other region of the code, in my case into the error region of another function in another module. And it's no use setting a breakpoint over there, because the program doesn't get past this point , although it's executing exactly this code.

Does anybody have a clue what this phenomena could be or how and where I can get a solution for it ? Thanks for any help ...

Wolfgang

What's the ppShapeRange??Can u tell me??

Ok, here the declarations ...

Dim ppShapeRange As PowerPoint.ShapeRange
Dim ppSlide As PowerPoint.Slide
Dim sPrintArea As String