OneNote may have failed to start correctly because of corrupted temporary files. Clearing the notebook cache that contains ...

OneNote may have failed to start correctly because of corrupted temporary files. Clearing the notebook cache that contains these files can resolve many errors. If you use shared notebooks in OneNote, any notes that were previously synced will be preserved, but any changes that have not yet been synced will be lost. Your notebooks will be closed and you will need to reopen them.