Native Xamarin.Android app keeps crashing in release mode

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I have a native Xamarin.Android app I've built a few years back and I've been maintaining it since then. Lately, I tried to build a new release but the app keeps crashing. I did tens of releases in the past using the same project and compilation settings. Here's an exemple of a stack trace I get in release:

[mono-rt] [ERROR] FATAL UNHANDLED EXCEPTION: System.IO.FileNotFoundException: Could not load file or assembly 'System.Core, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' or one of its dependencies.
[mono-rt]   at System.Threading.Tasks.TaskFactory`1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func`2[T,TResult] endFunction, System.Action`1[T] endAction10-21 13:24:49.970 F/mono-rt (15785): File name: 'System.Core, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e'
[mono-rt]   at Java.Interop.JniEnvironmentInfo..ctor () [0x00006] in :0 
[mono-rt]   at Java.Interop.JniEnvironment+c.b__35_0 () [0x00000] in :0 
[mono-rt]   at System.Threading.ThreadLocal`1[T].GetValueSlow () [0x00031] in :0 
[mono-rt]   at System.Threading.ThreadLocal`1[T].get_Value () [0x0003e] in :0 
[mono-rt]   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback () [0x00000] in :0ds.CallStaticObjectMethod (Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x0002d] in :0 
[mono-rt]   at Java.Interop.JniPeerMembers+JniStaticMethods.InvokeObjectMethod (System.String encodedMember, Java.Interop.JniArgumentValue* parameters) [0x00018] in :0 
[mono-rt]   at Java.Interop.JniEnvironment+StaticMet10-21 13:24:49.970 F/mono-rt (15785):   at Android.OS.Looper.get_MainLooper () [0x0000a] in :0 
[mono-rt]   at Android.Runtime.AndroidEnvironment.GetDefaultSyncContext () [0x00000] in :0 
[mono-rt]   at System.AndroidPlatform.GetDefaultSyncContext () [0x00000] in :0 
[mono-rt]   at System.Threading.SynchronizationContext.GetThreadLocalContext () [0x00005] in :0 
[mono-rt]   at System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation.Run (System.Threading.Tasks.Task ignored, System.Boolean canInlineContinuationTask) [0x00003] in :0 
[mono-rt]   at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in :0 
[mono-rt]   at System.Threading.Tasks.Task`1[TResult].TrySetResult (TResult result) [0x0004f] in :0 
[mono-rt]   at System.Threading.Tasks.TaskFactory`1+c__DisplayClass38_0`1[TResult,TArg1].b__0 (System.IAsyncResult iar) [0x00008] in :0 
[mono-rt]   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback () [0x00000] in 10-21 13:24:49.970 F/mono-rt (15785):   at (wrapper managed-to-native) System.Runtime.Remoting.Messaging.AsyncResult.Invoke(System.Runtime.Remoting.Messaging.AsyncResult)
[mono-rt]   at System.Runtime.Remoting.Messaging.AsyncResult.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem () [0x00000] in :0 
[mono-rt]   at System.Threading.ThreadPoolWorkQueue.Dispatch () [0x00074] in :0

From the stack trace, I have a feeling it might be a problem with the linker, but I have tried all 3 settings (Don't link, link SDK assemblies only, link all). When changing some code here and there, I have sometimes slightly different stack traces, but nothing really helpful. Here's the compilation settings I'm using:

Project settings #1

Project settings #2

Project settings #3

Project settings #4

Project settings #5

From time to time, the app will launch successfully without changing anytime special. It will only work once.

What I'm I missing?

visual-studio-mac xamarin xamarin.android android c#
2 Answers

Make sure your .NET framework is patched. Microsoft released patches to .NET to allow Portable Class Libraries to properly find the appropriate runtime (KB2468871). If you are seeing the above exception (or something like it), it means you’re missing the latest .NET framework patches.

You can read more about Portable Class Libraries on MSDN.

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