1099R with blank 2a

Hi, I contributed $5000 to Traditional IRA in 2021, then converted $1000 to Roth IRA in 2021 as well. The intention is to do Backdoor IRA. But then I converted the rest of the $4000 in 2022 (following tax year) to Roth IRA. Now I received the 1099R for Gross Distribution of $4000 and 2a Taxable amount is blank. Distribution code of "8J"
When I filed in Turbotax it is errored out asking to fill 2a of form 1099R and description for form 1044/1044-SR Worksheet.
What should I fill for both of these? Please advise. 

Thanks in advance!