PowerPoint was unable to display some of the text, images, or objects on slides in the file, "^0", because they have become ...

PowerPoint was unable to display some of the text, images, or objects on slides in the file, "^0", because they have become corrupted. Affected slides have been replaced by blank slides in the presentation and it is not possible to recover the lost information. To ensure that the file can be opened in previous versions of PowerPoint, use the Save As command (File menu) and save the file with either the same or a new name.