Android Question Error copying the database SQLITE to android

Hi

Can not execute this command
File.Copy (File.DirAssets, "alaoui.db", File.DirDefaultExternal, "toto.db")
message type
Logger connecté à : S88TLVC6IBZ5ZLMB
--------- beginning of crash
--------- beginning of main
--------- beginning of system
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **

main_activity_create (java line: 363)
java.io.FileNotFoundException: /storage/emulated/0/Android/data/b4a.example/files/toto.db: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:487)
at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
at anywheresoftware.b4a.objects.streams.File.OpenOutput(File.java:448)
at anywheresoftware.b4a.objects.streams.File.Copy(File.java:341)
at b4a.example.main._activity_create(main.java:363)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:196)
at b4a.example.main.afterFirstLayout(main.java:104)
at b4a.example.main.access$000(main.java:17)
at b4a.example.main$WaitForLayout.run(main.java:82)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:207)