This Form 1099-R appears to be reporting unrecoverable contribution basis due to investments in the Roth account in your 401(k) having lost value and you receiving a total distribution from the account. You should report this as a rollover to a Roth IRA so that this contribution basis will become part of your Roth IRA contribution basis.
If TurboTax continues to complain about a $0 amount in box 1, try changing it to $0.01.
