Translation:I have not seen my parents for a year, I miss them.
"I haven't seen my parents in a year. I miss them" was rejected. I think it's ok
It should be 我一年没有见父母了，我想他们。 When negating an time expression for how long, the time expression comes before the negation.
The answer is provided as "I have nt" then after submitting the question says it's own answer is a typo...