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I have the same question (0)Hi Sateesh Kalva,
Not sure if you've solved this but sharing this just in case..
AggregateException contains multiple exceptions, thrown by the await block in your case. Even though it contains many exceptions it shows only the last exception thrown. See if you can find more details in its InnerException.
Also, see if this site helps..
stackoverflow.com/.../how-to-fix-system-aggregateexception-occurred-in-mscorlib-dll