What can I do when the country court clerks office will not give me a letter.stating there is no record found.

What can I do when the country court clerks office will not give me a letter.stating there is no record found. I applied for a real estate license and submitted a background check. An arrest came out from 1985 in which I was a minor for a misdemeanor. They are asking for the records and an explanation. The court could not find a record and will not supply me with a letter. The state wants the letter.