Retirement tax questions

I contributed more than $6000 to my Roth 401(k) plan. TurboTax the program tells me that I made an excess contribution, tho when I spoke with a TurboTax expert earlier, I was told that the limit was $19,000 or so. How do I get the program to accept that what's in line 12 of my W-2 (AA) is acceptable?