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System.NullReferenceException: Object reference not set to an instance of an object.

at MS.Internal.Data.PropertyPathWorker.ReplaceItem(Int32 k, Object newO, Object parent) at MS.Internal.Data.PropertyPathWorker.UpdateSourceValueState(Int32 k ...
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can't get discovery from google

"System.NullReferenceException: Object reference not set to an instance of an object\r\n at IdentityModel.Client.ProtocolResponse+d__01[T].MoveNext () [0x000d1] in ...