Android Question Error "Unfortunately Bluetooth POS Printing has stopped" when trying to enable bluetooth printer

Hi,

I Got below error log when printing on bluetooth printer when activate below procedure, anybody may help ?

Sub Activity_Create(FirstTime As Boolean)
If FirstTime Then
Activity.LoadLayout("main")
BtAdmin.Initialize("BlueTooth")
BTConnection.Initialize("Printer")
Dim PairedDevices As Map
PairedDevices = BTConnection.GetPairedDevices

BTConnection.ConnectInsecure(BtAdmin,PairedDevices.Get(PairedDevices.GetKeyAt(0)), 1)
End If
End Sub

Logger connected to: ADVAN ADVAN T5C
--------- beginning of /dev/log/system
--------- beginning of /dev/log/main
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
main_activity_create (java line: 352)
java.util.NoSuchElementException
at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:353)
at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:379)
at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:377)
at anywheresoftware.b4a.objects.collections.Map$MyMap.getEntry(Map.java:213)
at anywheresoftware.b4a.objects.collections.Map$MyMap.getKey(Map.java:193)
at anywheresoftware.b4a.objects.collections.Map.GetKeyAt(Map.java:91)
at b4a.example.main._activity_create(main.java:352)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:186)
at b4a.example.main.afterFirstLayout(main.java:102)
at b4a.example.main.access$000(main.java:17)
at b4a.example.main$WaitForLayout.run(main.java:80)
at android.os.Handler.handleCallback(Handler.java:800)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5370)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)