Invalid impersonation prn email address

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Nov 15, 2016, 12:48:30 PM11/15/16

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Hello All,

i am using .net web api 2 and service account to fetch google Gmail data. i am getting below error while executing below code.

credential.RequestAccessTokenAsync(CancellationToken.None).Result

{"Error:\"invalid_request\", Description:\"Invalid impersonation prn email address.\", Uri:\"\""}