Exact error:
Severity Code Description Project File Line Suppression State Error DEP0001 : Unexpected Error: -1988945906 TestApp
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I had the same issue, and found that in my case it was occurring while the phone was downloading system updates in the background. App updates/installations from the app Store were also prevented from downloading/installing.
After the update had finished, all was back to working again.
As Windows Phone 10 doesn't seem to make it obvious that it's downloading updates, maybe worth checking this out if you hit this problem.