Conversion of a5 card to green card was rejected.

That's because you don't meet the requirements.

Rejecting a5 card to green card may be because you haven't lived for 5 years and don't meet the requirements.

The American permanent resident card, also known as the green card, is an identity document used to prove that foreigners have the status of permanent residents in the United States. The legal permanent residency of green card holders is an official immigration benefit.