I have observed your comments and worked over your requirements. I have not been able to reproduce the issue on my end. Please share if you are creating an object of Presentation class or you are loading some specific presentation. If you are getting this exception while loading a presentation then please share with us that presentation file so that we may investigate it further on our end to help you out. I request you to please try using Aspose.Slides for Java 15.6.0 on your end before sharing your kind feedback with us.