T-SQL with external script execution for in-database R integration

I'm trying to convert a scaleR script into T-SQL (with exteal_script execution) for in-database R analytics in SQL Server. The scaleR script that I'm working with is on the DeepDive Data Science Tutorial on Fraud data by MSDN.

All my data is in SQL Server now (from the tutorial), and all I want to do is query this table to get summary using the rxSummary scaleR function (in-database).
This is my attempt:

exec sp_execute_exteal_script 
@language = N'R', 
@script = N' 
sumOut <- rxSummary( 
formula = ~gender + balance + numTrans + numIntlTrans + creditLine, 
data = ccFraud 
) 
', 
@input_data_1 = N'select * from [DeepDive].[db_datareader].[ccFraudSmall]', 
@input_data_1_name = N'ccFraud', 
@output_data_1_name = N'summary' 
with result sets ((summary varchar(max) not null));

But this throws an error:

STDOUT message(s) from exteal script: 
Rows Read: 10000, Total Rows Processed: 10000, Total Chunk Time: Less than .001 seconds 
Computation time: 0.000 seconds. 
Msg 11536, Level 16, State 1, Line 5 
EXECUTE statement failed because its WITH RESULT SETS clause specified 1 result set(s), but the statement only sent 0 result set(s) at run time.

Any idea how to deal with this?

Am I missing a step?