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Having an issue when we click on the OneNote tab in the opportunity the following error message appears

When I go in via documents associated grid for the opportunity - you can see OneNote docs & access them, no issue.  So it doesn't seem to be a sharepoint permissions issue.

Any ideas as to why is it not allowing us to do this from the OneNote tab in the actitivies section? 

I checked to see if this happened on other record types & we were able to access the OneNote docs from the activities section no issue from other record types (e.g accounts).