If you get this message, try one or several of the below actions:
PowerPoint sometimes fails to save its own files in a perfect way, making it hard for 3rd party software to handle it. Opening the presentation and re-saving it again, remarkably often solves the import problem… So try opening up the presentation in PowerPoint and press Save again before you try to re-import the file, and you may get successful. If you want to assure that the file really is re-saved you can choose Save As and save the presentation under a new name and then upload the presentation.
If the file is in PPTX format, try re-saving the file as PPT and then try importing it to Slide Executive. Don't worry, your SmartArt and other PPTX specifics will continue to work as as long as you open the presentation with PowerPoint 2007. Also exporting to PPTX format will work well even from PPT slides.
Would this not work, look through the other FAQ:s before you contact our support.