Xamarin forms labs : System.NullReferenceException Object reference not set to an instance of an object

Question

I'm getting the following error after updating Xamarin Forms to 1.3.1 version.
Also tried with updating Xamarin.Forms.Labs to 1.2.1 pre2, its also not helping.

[MonoDroid] UNHANDLED EXCEPTION:
[MonoDroid] System.NullReferenceException: Object reference not set to an instance of an object
[MonoDroid] at Xamarin.Forms.Platform.Android.FormsApplicationActivity.OnDestroy () <IL 0x0002d, 0x000d8>
[MonoDroid] at Xamarin.Forms.Labs.Droid.XFormsApplicationDroid.OnDestroy () [0x0001f] in c:\Users\rmarinho\Documents\GitHub\Xamarin-Forms-Labs\src\Xamarin.Forms.Labs\Xamarin.Forms.Labs.Droid\XFormsApp.cs:61
[MonoDroid] at Android.App.Activity.n_OnDestroy (intptr,intptr) [0x00009] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.20-series/ba9bbbdd/source/monodroid/src/Mono.Android/platforms/android-17/src/generated/Android.App.Activity.cs:2524
[MonoDroid] at (wrapper dynamic-method) object.e36a43a7-84b6-4476-8a62-6959a3b43e6a (intptr,intptr) <IL 0x00011, 0x0003b>

Any help on how to fix this error?

Almost all cases of `NullReferenceException` are the same. Please see "[What is a NullReferenceException in .NET?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-in-net)" for some hints. — John Saunders, Jan 13 '15 at 06:03
No. I stick with Xamarin.Forms 1.2.3 and XFLabs 1.2.0 for now. @SamAleksov — Sudha, Jan 13 '15 at 18:12
XLabs 2.0-pre3 pushed into Nuget today with XF 1.3.1 support. — SKall, Jan 19 '15 at 21:58
I've compiled the XLabs 2.0 from source and the error is still there... — Sam Aleksov, Jan 20 '15 at 09:52
Have you Called in your MainActivity to LoadApplication(YourCustomApplication)? — IdoT, Feb 17 '15 at 15:15

score 0 · Answer 1 · answered Jan 15 '15 at 20:02

I looked at the source code of FormsApplicationActivity and it looks like you're disposing your object somehow before assigning a Page to it (or at least that's one mode of failure I think is possible).

Share your code with us for a more detail solution, but basically try setting the App's main page before disposing.

Xamarin forms labs : System.NullReferenceException Object reference not set to an instance of an object

1 Answers1