Installing SQL Server R Services - error

I'm trying to Install SQL Server R Services. I'm using SQL SERVER 2016 RC1. I'm following this step by step tutorial https://msdn.microsoft.com/en-us/library/mt604883.aspx Everything seems to install ok, but I get the following error when testing an R script.

Msg 39021, Level 16, State 1, Line 1

Unable to launch runtime for 'R' script. Please check the configuration of the 'R' runtime.

Msg 39019, Level 16, State 1, Line 1

An external script error occurred: Unable to launch the runtime. ErrorCode 0x80070490: 1168(Element not found.).

Msg 11536, Level 16, State 1, Line 1

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.

I'm using the following code:

exec sp_execute_external_script  @language =N'r',
@script=N'OutputDataSet<-InputDataSet',  
@input_data_1 =N'select 1 as hello'
with result sets (([hello] int not null));
go

Any ideas as to what may be going wrong?

Thank You

I had the same issue initially. I had mistakenly skipped the post-installation steps, specifically the step to register the R runtime with SQL Server. See MSDN post: https://msdn.microsoft.com/en-us/library/mt590536.aspx