An Azure NoSQL database service for app development.
According to this SO post that isn't an error, but more the side effect of attempting to evaluate properties when using the VS debugger that require interaction with another thread in order to yield their values:
https://stackoverflow.com/questions/29985150/visual-studio-during-debugging-the-function-evaluation-requires-all-threads-to/52193497
Do you encounter any exceptions when you're not debugging?