There are a couple of common fixes if you receive an error message when adding a sticker to a Class Notebook page.
Review student work
Check to see which views you have open in OneNote. Errors can occur if the Review Student Work and Sticker views are open at the same time.
Close the Review Student Work view, then add your sticker again.
Blue circle
If you're using OneNote 2016 and you see a blue circle that prevents you from inserting a sticker, this is caused by certain areas of the page being corrupt. The following workarounds can be used to resolve this issue:
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Copy the contents onto a new page, then insert a sticker.
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Alternatively, open a notebook into OneNote for the web or OneNote for Windows 10, then insert a sticker.
