PDF notes no longer accessible

All my notes with attached PDFs have suddenly become inaccessible. When I try to open them I get a grey screen with the words docs.zoho.com refused to connect on it. Is this an error, a bug or a new 'feature option'?

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Migrate your Notebook data to the new, mobile Notebook.
Zoho Notebook is transforming. The new version will include exciting new features and a completely new user experience. The initial version will be mobile based, available for Android and iOS. A new web version will be available after the initial mobile release. With the release of the new Notebook approaching, we're migrating most of your current data to the new version. Once the new version is released, there will be an additional window to migrate your data. We will not provide access to the