1099-R

I’m getting an error when I go to efile my 2020 taxes. The error I get is related to box 7 (distribution code) on my 1099-R Form. Since I have codes B and 2 on there turbo tax says “Box 7a distribution code is invalid. A distribution code of 'B' should not be used for IRA distributions”. I have 3 1099-Rs 2 of them are Roth 401K and 1 is a regular 401K. I’m not sure