etValue of type System.Reflection.PropertyInfo is not supported in the expression tree System.String Type.GetValue({document}). in MongoDB.Driver    at MongoDB.Driver.Linq.Translators.AggregateLanguageTranslator.TranslateMethodCall(MethodCallExpression node)
   at MongoDB.Driver.Linq.Translators.AggregateLanguageTranslator.TranslateValue(Expression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslateGroupBy(GroupByExpression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslateSelect(SelectExpression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslateOrderBy(OrderByExpression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslatePipeline(PipelineExpression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node, IBsonSerializerRegistry serializerRegistry, ExpressionTranslationOptions translationOptions)
   at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.ExecuteAsync[TResult](Expression expression, CancellationToken cancellationToken)
   at MongoDB.Driver.Linq.MongoQueryableImpl`2.ToCursorAsync(CancellationToken cancellationToken)
   at MongoDB.Driver.IAsyncCursorSourceExtensions.<ToListAsync>d__16`1.MoveNext()