我目前正尝试使用. createFromAsset从资产内的数据库文件预填充ROOM数据库。在运行应用程序时，我收到"原因：java.lang.RuntimeException:无法复制数据库文件。"错误。
我的数据库文件路径assets/数据库/cardb.db

E/AndroidRuntime: FATAL EXCEPTION: arch_disk_io_0
    Process: com.example.myapplication, PID: 8068
    java.lang.RuntimeException: Exception while computing database live data.
        at androidx.room.RoomTrackingLiveData.refreshRunnable$lambda-0(RoomTrackingLiveData.kt:74)
        at androidx.room.RoomTrackingLiveData.$r8$lambda$UkyPj-RMUoTXOMbUuy5NWSwmo0E(Unknown Source:0)
        at androidx.room.RoomTrackingLiveData$$ExternalSyntheticLambda0.run(Unknown Source:2)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
        at java.lang.Thread.run(Thread.java:1012)
     Caused by: java.lang.RuntimeException: Unable to copy database file.
        at androidx.room.SQLiteCopyOpenHelper.verifyDatabaseFile(SQLiteCopyOpenHelper.kt:114)
        at androidx.room.SQLiteCopyOpenHelper.getWritableDatabase(SQLiteCopyOpenHelper.kt:68)
        at androidx.room.RoomDatabase.inTransaction(RoomDatabase.kt:629)
        at androidx.room.RoomDatabase.assertNotSuspendingTransaction(RoomDatabase.kt:448)
        at androidx.room.RoomDatabase.query(RoomDatabase.kt:477)
        at androidx.room.util.DBUtil.query(DBUtil.kt:75)
        at com.example.myapplication.data.CarDao_Impl$1.call(CarDao_Impl.java:34)
        at com.example.myapplication.data.CarDao_Impl$1.call(CarDao_Impl.java:31)
        at androidx.room.RoomTrackingLiveData.refreshRunnable$lambda-0(RoomTrackingLiveData.kt:72)
        at androidx.room.RoomTrackingLiveData.$r8$lambda$UkyPj-RMUoTXOMbUuy5NWSwmo0E(Unknown Source:0) 
        at androidx.room.RoomTrackingLiveData$$ExternalSyntheticLambda0.run(Unknown Source:2) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637) 
        at java.lang.Thread.run(Thread.java:1012) 
     Caused by: java.io.FileNotFoundException: database/cardb.db
        at android.content.res.AssetManager.nativeOpenAsset(Native Method)
        at android.content.res.AssetManager.open(AssetManager.java:904)
        at android.content.res.AssetManager.open(AssetManager.java:881)
        at androidx.room.SQLiteCopyOpenHelper.copyDatabaseFile(SQLiteCopyOpenHelper.kt:156)
        at androidx.room.SQLiteCopyOpenHelper.verifyDatabaseFile(SQLiteCopyOpenHelper.kt:111)
        at androidx.room.SQLiteCopyOpenHelper.getWritableDatabase(SQLiteCopyOpenHelper.kt:68) 
        at androidx.room.RoomDatabase.inTransaction(RoomDatabase.kt:629) 
        at androidx.room.RoomDatabase.assertNotSuspendingTransaction(RoomDatabase.kt:448) 
        at androidx.room.RoomDatabase.query(RoomDatabase.kt:477) 
        at androidx.room.util.DBUtil.query(DBUtil.kt:75) 
        at com.example.myapplication.data.CarDao_Impl$1.call(CarDao_Impl.java:34) 
        at com.example.myapplication.data.CarDao_Impl$1.call(CarDao_Impl.java:31) 
        at androidx.room.RoomTrackingLiveData.refreshRunnable$lambda-0(RoomTrackingLiveData.kt:72) 
        at androidx.room.RoomTrackingLiveData.$r8$lambda$UkyPj-RMUoTXOMbUuy5NWSwmo0E(Unknown Source:0) 
        at androidx.room.RoomTrackingLiveData$$ExternalSyntheticLambda0.run(Unknown Source:2) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637) 
        at java.lang.Thread.run(Thread.java:1012) 

这是我的数据库文件

package com.example.myapplication.data

import android.content.Context
import android.os.Bundle
import android.util.Log
import androidx.room.Database
import androidx.room.Room
import androidx.room.RoomDatabase
import java.io.File

@Database(entities = [CarMake::class], version = 1, exportSchema = false)
abstract class CarDatabase: RoomDatabase() {
    abstract fun carDao(): CarDao

    companion object{

        @Volatile
        private var INSTANCE : CarDatabase? = null

        fun provideDatabase(context : Context): CarDatabase{
            //Log.d("MyActivity", context.toString())

            val tempInstance = INSTANCE
            if (tempInstance != null){
                return tempInstance
            }
            synchronized(this){

                val instance = Room.databaseBuilder(
                    context.applicationContext,
                    CarDatabase::class.java,"car_database")
                    .createFromAsset("database/cardb.db")
                    .build()
                INSTANCE = instance
                return instance
            }

        }

    }
}

我试着重新创建数据库文件以防出错。我可以在SQLite浏览器中打开它并查看结构和数据。我还试着重命名数据库文件，将db移动到assets文件夹中。此外，我尝试在虚拟设备中查看我的应用程序数据，但数据库不存在于资产文件夹中。我希望数据库只需简单地复制，并按其预期的方式运行。
我看过一些关于这个问题的帖子。