Material Properties and reinforcement settings in RCDC V

I was using RCDC V, then I was about to input the Fy (275) and Concrete property (21) in material properties. However, RCDC is showing an error that the value is not in the permissible range of values . here is a screenshot of it.  ..

Also, How can you change the units inside the software from english to SI? 

Thank you very much.