Contributions to a Roth 401k can only be made by payroll deduction and they are reported on your w-2. Don't enter workplace plans in the section for IRAs. They are not the same.
You normally can't have an excess 401k contribution unless you worked for two different employers during the year, did you do this?
Or, did you enter your 401k as if it was an IRA, causing the program to think you had excess when you really didn't?
