Android Question When I run Program Then It show the Error.

When I run Program then it show me error.
i will try to solve this error and find the tutorials or any guide but its not find.
Logger connected to: emulator-5554
*** Service (starter) Create ***
Error occurred on line: 25 (Starter)
java.io.FileNotFoundException: /mnt/sdcard/Android/data/b4a.example/files/virtual_assets/data.db (No such file or directory)
at org.apache.harmony.luni.platform.OSFileSystem.open(Native Method)
at dalvik.system.BlockGuard$WrappedFileSystem.open(BlockGuard.java:232)
at java.io.FileInputStream.<init>(FileInputStream.java:80)
at anywheresoftware.b4a.objects.streams.File.OpenInput(File.java:199)
at anywheresoftware.b4a.objects.streams.File.Copy(File.java:335)
at b4a.example.starter._service_create(starter.java:178)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:710)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:339)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:249)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:139)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:166)
at b4a.example.starter.onCreate(starter.java:55)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:1920)
at android.app.ActivityThread.access$2500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:982)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3647)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
** Service (starter) Start **