How to amend federal return 2019 and one state only? The desktop turbotax amend 2019 doesn't allow me to continue and keeps saying error:190.

I only need to amend federal and one state. This super annoying tool doesn't allow me to continue after I selected the tax file which I downloaded from the site. It kept telling me I need to get state returns as well, so I continued to select the one state I need to amend the return for - and then it just leads me back to the start where I need to choose/add the test file!