I entered a Roth 1099-R and got taxed on profit. Had over 5 years and 70 old. box 7 =T, and taxable not determined.

I entered a Roth 1099-R and got taxed on profit. i had it for over 5 years and i am 70 old. box 7 =T, box 2a is blank, and 2b is taxable amount not determined.