Room 관련한 에러 질문 올려용

 C:\Users\82103\AndroidStudioProjects\coco\app\build\generated\source\kapt\debug\com\bokchi\coco\db\CoinPriceDatabase_Impl.java:64: error: onCreate(SupportSQLiteDatabase) in <anonymous com.bokchi.coco.db.CoinPriceDatabase_Impl$1> cannot override onCreate(SupportSQLiteDatabase) in Delegate

protected void onCreate(SupportSQLiteDatabase _db) {

^

attempting to assign weaker access privileges; was public

이런 에러가 나는데 혹시 어떤 문제인지 알 수있을까요?

깃주소도 첨부합니다

https://github.com/chanho0908/CoCo