Error reporting in WindowsPhone

I'm experiencing strange issues on my new app's error reports. While it is reporting errors as it should, only one of the reports does contain actually useful stacktrace data. The others just show things like this:

xxx.App.Application_UnhandledException                                  0x0000002e    
MS.Internal.Error.CallApplicationUEHandler                              0x00000066    
System.Windows.Application.ShouldIgnoreUnhandledException               0x0000000e    
Microsoft.Phone.Shell.Interop.NativeCallbackInteropWrapper.OnCommand    0x00000030

I am asking to see if someone with greater experience in WP development has mor information on how error reporting is done and how you can be able to adress issues. Does this mean the exception is on the OS side? Maybe out of memory?

Hope I'm not doing it wrong since this is my first question.

Thanks in advance!