Keynote files are a fantastic way to annotate our drawings but they can through up a couple of challenges, one error message that can be avoided is shown below. (Unfortunately the Warning message is very vague and doesn’t offer up any clues!)
Although this warning can be ignored, it is best to try and work out what the error means, and try and solve it. This error is due to converting an excel file to the Keynote text file. In the excel file if you have an entire empty row, it will convert this into a blank Keynote value and Keynote text, thus producing an error on loading.
To fix this error all you need to do is delete the entire blank row in the excel schedule, and resave your Keynote .txt file.