Android Room error: Schema '1.json' required for migration was not found at the schema out folder

Question

I want to implement autoMigrations with Android Room

@Database(
    entities = [User1Message::class],
    version = 2,
    autoMigrations = [AutoMigration (from = 1, to = 2)],
    )
abstract class User1MessageDatabase : RoomDatabase() {

I also add this code in gradle

kapt {
    arguments {
        arg("room.schemaLocation", "$projectDir/schemas")
    }
}

But error message says that not found.

1.json is in folder already

How to solve it?

UPDATE: User1MessageDatabase has only 2.json how to auto generate 1.json?

Answer 1

how to auto generate 1.json?

Revert the code to version 1, then add the exportSchema = true and then compile the project. Move to version 2.