Android Question Problem with File.ListFiles on an external sdcard with Android 4.4.2

Sub Activity_Create(FirstTime As Boolean)
    lblFiles.Initialize("")
    Activity.AddView(lblFiles, 10%x, 10%y, 80%x, 80%y)
    Dim lst0 As List
    lst0 = File.ListFiles("/sdcard1/")
   
    For i = 0 To lst0.Size - 1
        lblFiles.Text = lblFiles.Text & CRLF & lst0.Get(i)
    Next
End Sub

Installing file.
PackageAdded: package:b4a.example
** Activity (main) Resume **
Timeline: Activity_idle id: android.os.BinderProxy@44d5f448 time:98649266
Installing file.
GC_CONCURRENT freed 370K, 14% free 50957K/58924K, paused 18ms+3ms, total 75ms
** Activity (main) Pause, UserClosed = false **
PackageAdded: package:b4a.example
Failed to destroy process 22281
libcore.io.ErrnoException: kill failed: ESRCH (No such process)
at libcore.io.Posix.kill(Native Method)
at libcore.io.ForwardingOs.kill(ForwardingOs.java:86)
at java.lang.ProcessManager$ProcessImpl.destroy(ProcessManager.java:260)
at anywheresoftware.b4a.phone.Phone$LogCat.LogCatStop(Phone.java:773)
at anywheresoftware.b4a.b4abridge.service1._stoplogcat(service1.java:621)
at anywheresoftware.b4a.b4abridge.service1._streams_newdata(service1.java:682)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:170)
at anywheresoftware.b4a.BA$3.run(BA.java:315)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5151)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
at dalvik.system.NativeStart.main(Native Method)
GC_CONCURRENT freed 399K, 14% free 50942K/58924K, paused 16ms+8ms, total 85ms

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