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Device Unavailable (in Opera Unite) should mean that either you made a typo in address or the Opera browser that was serving the content is offline.
Unfortunately, right now, since current Opera release is alpha (i.e. prerelease) there are some bugs, particularly one that keeps disconnecting service from main servers. This would probably be fixed.
The workaround for your own services (for now) is to disable Unite and then enable it.
Opera Unite relies on user keeping the browser window open, then a visitor can access the files they share or the applications they run. If the browser is closed - this information is unavailable.
In some near future you can try to use Web Archive → or use Google's cache → to see whether the information was cached. It it was - you might be able to recover a part of it.