What does this error mean?
B4X:
** Activity (main) Create, isFirst = true **
android.content.res.Resources$NotFoundException: Resource ID #0x0
at android.content.res.Resources.getValue(Resources.java:1013)
at android.content.res.Resources.loadXmlResourceParser(Resources.java:2098)
at android.content.res.Resources.getLayout(Resources.java:852)
at android.view.LayoutInflater.inflate(LayoutInflater.java:394)
at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
at uk.co.martinpearman.b4a.osmdroid.views.overlays.MyBalloonOverlayView.loadLayout(MyBalloonOverlayView.java:93)
at uk.co.martinpearman.b4a.osmdroid.views.overlays.MyBalloonOverlayView.<init>(MyBalloonOverlayView.java:35)
at uk.co.martinpearman.b4a.osmdroid.views.overlays.MyItemizedOverlayWithFocus.<init>(MyItemizedOverlayWithFocus.java:90)
at uk.co.martinpearman.b4a.osmdroid.views.overlays.MyItemizedOverlayWithFocus.<init>(MyItemizedOverlayWithFocus.java:48)
at uk.co.martinpearman.b4a.osmdroid.views.overlays.wrappers.MyItemizedOverlayWithFocusWrapper.Initialize(MyItemizedOverlayWithFocusWrapper.java:37)
at uop.UniMap3.main._activity_create(main.java:424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:173)
at uop.UniMap3.main.afterFirstLayout(main.java:98)
at uop.UniMap3.main.access$100(main.java:16)
at uop.UniMap3.main$WaitForLayout.run(main.java:76)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
android.content.res.Resources$NotFoundException: Resource ID #0x0
