Tax filing 2021

Hi 

I am on opt (F1 student visa) status. I am trying to use turbo tax for my tax filing. This is the first time I will be filing as a resident for tax purposes as it is my 6th calender year in the US. 

Last year ( 2020). I filed only form 8843 as I had no income as a student. 

Now, while using turbo tax for filing for 2021, it says I am required to incoporate 2020 form 1040. 

I do have my W2 for 2021. Please advice how to procees. thanks