I downloaded Slides. In my project I have referenced Slides verson 4.1.1.0, runtime version 2.0.50727.
In documentation you state there is Shapes.AddAutoShape method, which takes as parameter ShapeType. But neither can be found in the class library. What is the matter?
In order to add AutoShape in PPTX, please visit the following documentation link. Please also visit link_1 for AddAutoShape() method implementation and link_2 for ShapeType parameter explanation. Please feel free to share, if the problem still persists.