What’s going on in the rest of the import screen? Did you choose the correct field separator? Does the data look right in table in the “File” section?
Have you checked that your file complies with all of these conditions – Text Files - Anki Manual?
Have you tried looking at your file as plain text, so you can see what the difference is between line1 and line2?
Have you tried removing line1 – since those aren’t the names of your fields anyway?