Error
This file is not a valid presentation file or contains multiple slides. Only single slides can be stored in a Slide Library. To publish a file with multiple slides, click Upload on the Slide Library, and then click Publish Slides.
How can I fix it?
Solution
This is a known issue that's caused by activation of the following features in REM site collection:
SharePoint Server Enterprise Site features
SharePoint Server Standard Site features
The problem will appear every time these SharePoint features are activated (it adds a receiver to rem lists), and so each time it's necessary to reactivate the 'REM Courses' feature to remove the receiver and fix the problem.
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