Application is crashing upon clicking the app icon in device

Hi Team,
Xamarin iOS app is crashed in device after downloading from TestFlight. Same thing happening even manually creating IPA/app and installing through itunes. App is working fine when installing through debug mode. Need help on this. Please find the Crash logs :

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Triggered by Thread: 0

Filtered syslog:
None found

Thread 0 name: tid_b07 Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x21c44c84 pthread_kill + 8
1 libsystem_pthread.dylib 0x21cea732 pthread_kill + 62
2 libsystem_c.dylib 0x21bdb0ac abort + 108
3 FormFITiOS 0x0006ddc0 mono_handle_native_sigsegv (mini-exceptions.c:2341)
4 libsystem_platform.dylib 0x21ce4076 sigtramp + 42
5 libsystem_pthread.dylib 0x21cea732 pthread_kill + 62
6 libsystem_c.dylib 0x21bdb0ac abort + 108
7 FormFITiOS 0x0012d66c xamarin_initialize (runtime.m:938)
8 FormFITiOS 0x0006e2e0 mono_invoke_unhandled_exception_hook (mini-exceptions.c:2786)
9 FormFITiOS 0x0006da64 mono_handle_exception_internal (mini-exceptions.c:1727)
10 FormFITiOS 0x0006cf76 mono_handle_exception (mini-exceptions.c:1950)
11 FormFITiOS 0x000669aa mono_arm_throw_exception (exceptions-arm.c:163)
12 FormFITiOS 0x011b8dc8 throw_exception + 64
13 FormFITiOS 0x00f0c804 System_AppDomain_Load_System_Reflection_AssemblyName + 40
14 FormFITiOS 0x00f60330 System_Reflection_Assembly_Load_System_Reflection_AssemblyName + 40
15 FormFITiOS 0x024e308c Xamarin_Forms_Xaml_XamlParser_GetElementType_Xamarin_Forms_Xaml_XmlType_System_Xml_IXmlLineInfo_System_Reflection_Assembly_Xamarin_Forms_Xaml_XamlParseException
+ 1148
16 FormFITiOS 0x024da354 Xamarin_Forms_Xaml_CreateValuesVisitor_Visit_Xamarin_Forms_Xaml_ElementNode_Xamarin_Forms_Xaml_INode + 196
17 FormFITiOS 0x024d4574 Xamarin_Forms_Xaml_ElementNode_Accept_Xamarin_Forms_Xaml_IXamlNodeVisitor_Xamarin_Forms_Xaml_INode + 724
18 FormFITiOS 0x024d44d4 Xamarin_Forms_Xaml_ElementNode_Accept_Xamarin_Forms_Xaml_IXamlNodeVisitor_Xamarin_Forms_Xaml_INode + 564
19 FormFITiOS 0x024d44d4 Xamarin_Forms_Xaml_ElementNode_Accept_Xamarin_Forms_Xaml_IXamlNodeVisitor_Xamarin_Forms_Xaml_INode + 564
20 FormFITiOS 0x024d477c Xamarin_Forms_Xaml_RootNode_Accept_Xamarin_Forms_Xaml_IXamlNodeVisitor_Xamarin_Forms_Xaml_INode + 428
21 FormFITiOS 0x024d2e28 Xamarin_Forms_Xaml_XamlLoader_Load_Xamarin_Forms_BindableObject_string + 836
22 FormFITiOS 0x024d2a30 Xamarin_Forms_Xaml_XamlLoader_Load_Xamarin_Forms_BindableObject_System_Type + 92
23 FormFITiOS 0x024d298c Xamarin_Forms_Xaml_Extensions_LoadFromXaml_TView_REF_TView_REF_System_Type + 40
24 FormFITiOS 0x0013baa0 FormFIT_Views_LoginPage_InitializeComponent + 60
25 FormFITiOS 0x0013b6c4 FormFIT_Views_LoginPage__ctor_FormFIT_ILoginManager_FormFIT_App + 148
26 FormFITiOS 0x0013a3b4 FormFIT_App_ShowLoginPage + 56
27 FormFITiOS 0x0013a1e4 FormFIT_App__ctor + 300
28 FormFITiOS 0x001388ec FormFIT_iOS_AppDelegate_FinishedLaunching_UIKit_UIApplication_Foundation_NSDictionary + 168
29 FormFITiOS 0x01167dcc wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 256
30 FormFITiOS 0x00076b4a mono_jit_runtime_invoke (mini-runtime.c:2564)
31 FormFITiOS 0x000bf91a mono_runtime_invoke (object.c:2897)
32 FormFITiOS 0x025126de native_to_managed_trampoline_32(objc_object*, objc_selector*, _MonoMethod**, UIApplication*, NSDictionary*, char const*, char const*, char const*, char const*) (registrar.m:1185)
33 FormFITiOS 0x02512b74 -[AppDelegate application:didFinishLaunchingWithOptions:] (registrar.m:24603)
34 UIKit 0x261611fc -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 392
35 UIKit 0x26387fe4 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 3080
36 UIKit 0x2638beba -[UIApplication _runWithMainScene:transitionContext:completion:] + 1570
37 UIKit 0x2639fb9c __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke3228 + 36
38 UIKit 0x263893aa -[UIApplication workspaceDidEndTransaction:] + 134
39 FrontBoardServices 0x23294c7e -[FBSSerialQueue _performNext] + 230
40 FrontBoardServices 0x23294f70 -[FBSSerialQueue _performNextFromRunLoopSource] + 48
41 CoreFoundation 0x21f7368e __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION
+ 14
42 CoreFoundation 0x21f7327c CFRunLoopDoSources0 + 452
43 CoreFoundation 0x21f715ea __CFRunLoopRun + 794
44 CoreFoundation 0x21ec4bf8 CFRunLoopRunSpecific + 520
45 CoreFoundation 0x21ec49e4 CFRunLoopRunInMode + 108
46 UIKit 0x2615a5bc -[UIApplication _run] + 524
47 UIKit 0x26154ba0 UIApplicationMain + 144
48 FormFITiOS 0x00ac02f8 wrapper_managed_to_native_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr + 252
49 FormFITiOS 0x00230fd0 UIKit_UIApplication_Main_string___intptr_intptr (UIApplication.cs:79)
50 FormFITiOS 0x00230e74 UIKit_UIApplication_Main_string___string_string (UIApplication.cs:63)
51 FormFITiOS 0x00138810 FormFIT_iOS_Application_Main_string
+ 48
52 FormFITiOS 0x01167dcc wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 256
53 FormFITiOS 0x00076b4a mono_jit_runtime_invoke (mini-runtime.c:2564)
54 FormFITiOS 0x000bf91a mono_runtime_invoke (object.c:2897)
55 FormFITiOS 0x000c2f4c mono_runtime_exec_main (object.c:4221)
56 FormFITiOS 0x00138104 xamarin_main (monotouch-main.m:454)
57 FormFITiOS 0x025585e6 main (main.armv7.m:101)
58 libdyld.dylib 0x21b73872 start + 2

Thread 1:
0 libsystem_kernel.dylib 0x21c4588c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x21ce7b34 _pthread_wqthread + 1036
2 libsystem_pthread.dylib 0x21ce7718 start_wqthread + 8

Thread 2 name: Dispatch queue: com.apple.libdispatch-manager
Thread 2:
0 libsystem_kernel.dylib 0x21c46320 kevent_qos + 24
1 libdispatch.dylib 0x21b3e098 _dispatch_mgr_invoke + 256
2 libdispatch.dylib 0x21b3ddf6 _dispatch_mgr_thread$VARIANT$mp + 38

Thread 3 name: Dispatch queue: AXBinaryMonitorQueue
Thread 3:
0 libsystem_kernel.dylib 0x21c30c74 semaphore_wait_trap + 8
1 libsystem_platform.dylib 0x21ce13a4 _os_semaphore_wait + 12
2 libdispatch.dylib 0x21b35082 _dispatch_barrier_sync_f_slow + 370
3 AccessibilityUtilities 0x29eba5ce __46-[AXBinaryMonitor _addHandler:withName:toMap:]_block_invoke + 114
4 libdispatch.dylib 0x21b29b5a _dispatch_call_block_and_release + 10
5 libdispatch.dylib 0x21b3675a _dispatch_queue_drain$VARIANT$mp + 1758
6 libdispatch.dylib 0x21b35d98 _dispatch_queue_invoke$VARIANT$mp + 284
7 libdispatch.dylib 0x21b38920 _dispatch_root_queue_drain + 1560
8 libdispatch.dylib 0x21b38304 _dispatch_worker_thread3 + 96
9 libsystem_pthread.dylib 0x21ce7b28 _pthread_wqthread + 1024
10 libsystem_pthread.dylib 0x21ce7718 start_wqthread + 8

Thread 4 name: WebThread
Thread 4:
0 libsystem_kernel.dylib 0x21c30c24 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x21c30a28 mach_msg + 40
2 CoreFoundation 0x21f73354 __CFRunLoopServiceMachPort + 136
3 CoreFoundation 0x21f716dc __CFRunLoopRun + 1036
4 CoreFoundation 0x21ec4bf8 CFRunLoopRunSpecific + 520
5 CoreFoundation 0x21ec49e4 CFRunLoopRunInMode + 108
6 WebCore 0x25271256 RunWebThread(void*) + 422
7 libsystem_pthread.dylib 0x21ce985a _pthread_body + 138
8 libsystem_pthread.dylib 0x21ce97ce _pthread_start + 110
9 libsystem_pthread.dylib 0x21ce7724 thread_start + 8

Thread 5:
0 libsystem_kernel.dylib 0x21c449c0 __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x21ce8dec _pthread_cond_wait + 536
2 libsystem_pthread.dylib 0x21ce9c98 pthread_cond_wait + 40
3 FormFITiOS 0x00100aa0 thread_func (sgen-thread-pool.c:91)
4 libsystem_pthread.dylib 0x21ce985a _pthread_body + 138
5 libsystem_pthread.dylib 0x21ce97ce _pthread_start + 110
6 libsystem_pthread.dylib 0x21ce7724 thread_start + 8

Thread 6 name: tid_2d03
Thread 6:
0 libsystem_kernel.dylib 0x21c30c74 semaphore_wait_trap + 8
1 FormFITiOS 0x0009b92e finalizer_thread (mono-os-semaphore.h:73)
2 FormFITiOS 0x000e4944 start_wrapper (threads.c:717)
3 FormFITiOS 0x0011cfa2 inner_start_thread (mono-threads-posix.c:92)
4 libsystem_pthread.dylib 0x21ce985a _pthread_body + 138
5 libsystem_pthread.dylib 0x21ce97ce _pthread_start + 110
6 libsystem_pthread.dylib 0x21ce7724 thread_start + 8

Thread 7:
0 libsystem_kernel.dylib 0x21c4588c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x21ce7b34 _pthread_wqthread + 1036
2 libsystem_pthread.dylib 0x21ce7718 start_wqthread + 8

Thread 8:
0 libsystem_kernel.dylib 0x21c4588c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x21ce7b34 _pthread_wqthread + 1036
2 libsystem_pthread.dylib 0x21ce7718 start_wqthread + 8

Thread 9:

Thread 10 name: tid_6303
Thread 10:
0 libsystem_kernel.dylib 0x21c449c0 __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x21ce8dec _pthread_cond_wait + 536
2 libsystem_pthread.dylib 0x21ce9c98 pthread_cond_wait + 40
3 FormFITiOS 0x00105762 _wapi_handle_timedwait_signal_handle (mono-os-mutex.h:105)
4 FormFITiOS 0x00111ed6 wapi_WaitForSingleObjectEx (wait.c:189)
5 FormFITiOS 0x000e0908 mono_wait_uninterrupted (threads.c:1518)
6 FormFITiOS 0x000e0a4c ves_icall_System_Threading_WaitHandle_WaitOne_internal (threads.c:1652)
7 FormFITiOS 0x01027324 wrapper_managed_to_native_System_Threading_WaitHandle_WaitOne_internal_System_Threading_WaitHandle_intptr_int_bool + 108
8 FormFITiOS 0x0102796c System_Threading_WaitHandle_WaitOne_int_bool + 144
9 FormFITiOS 0x01027a08 System_Threading_WaitHandle_WaitOne_int + 52
10 FormFITiOS 0x01025490 System_Threading_Timer_Scheduler_SchedulerThread + 2220
11 FormFITiOS 0x00e80908 System_Threading_ThreadHelper_ThreadStart_Context_object + 208
12 FormFITiOS 0x00e7eb0c System_Threading_ExecutionContext_RunInternal_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 532
13 FormFITiOS 0x00e7e8ec System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 52
14 FormFITiOS 0x00e7e86c System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object + 100
15 FormFITiOS 0x00e80a5c System_Threading_ThreadHelper_ThreadStart + 64
16 FormFITiOS 0x01167dcc wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 256
17 FormFITiOS 0x00076b4a mono_jit_runtime_invoke (mini-runtime.c:2564)
18 FormFITiOS 0x000bf91a mono_runtime_invoke (object.c:2897)
19 FormFITiOS 0x000e49a6 start_wrapper (threads.c:740)
20 FormFITiOS 0x0011cfa2 inner_start_thread (mono-threads-posix.c:92)
21 libsystem_pthread.dylib 0x21ce985a _pthread_body + 138
22 libsystem_pthread.dylib 0x21ce97ce _pthread_start + 110
23 libsystem_pthread.dylib 0x21ce7724 thread_start + 8

Thread 11 name: tid_6207
Thread 11:
0 libsystem_kernel.dylib 0x21c449c0 __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x21ce8dec _pthread_cond_wait + 536
2 libsystem_pthread.dylib 0x21ce9c98 pthread_cond_wait + 40
3 FormFITiOS 0x00105762 _wapi_handle_timedwait_signal_handle (mono-os-mutex.h:105)
4 FormFITiOS 0x00111ed6 wapi_WaitForSingleObjectEx (wait.c:189)
5 FormFITiOS 0x000bb38c ves_icall_System_Threading_Monitor_Monitor_wait (monitor.c:1294)
6 FormFITiOS 0x0101f8e4 System_Threading_Monitor_Wait_object_int + 128
7 FormFITiOS 0x00e4ec4c System_Threading_SemaphoreSlim_WaitUntilCountOrTimeout_int_uint_System_Threading_CancellationToken + 108
8 FormFITiOS 0x00e4e9dc System_Threading_SemaphoreSlim_Wait_int_System_Threading_CancellationToken + 536
9 FormFITiOS 0x0131762c System_Collections_Concurrent_BlockingCollection_1_T_REF_TryTakeWithNoTimeValidation_T_REF__int_System_Threading_CancellationToken_System_Threading_CancellationTokenSource (BlockingCollection.cs:712)
10 FormFITiOS 0x013174c0 System_Collections_Concurrent_BlockingCollection_1_T_REF_TryTake_T_REF__int_System_Threading_CancellationToken (BlockingCollection.cs:667)
11 FormFITiOS 0x01317234 System_Collections_Concurrent_BlockingCollection_1_T_REF_Take (BlockingCollection.cs:554)
12 FormFITiOS 0x020c02cc Xamarin_Forms_Platform_iOS_CADisplayLinkTicker_StartThread + 44
13 FormFITiOS 0x00e80908 System_Threading_ThreadHelper_ThreadStart_Context_object + 208
14 FormFITiOS 0x00e7eb0c System_Threading_ExecutionContext_RunInternal_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 532
15 FormFITiOS 0x00e7e8ec System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 52
16 FormFITiOS 0x00e7e86c System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object + 100
17 FormFITiOS 0x00e80a5c System_Threading_ThreadHelper_ThreadStart + 64
18 FormFITiOS 0x01167dcc wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 256
19 FormFITiOS 0x00076b4a mono_jit_runtime_invoke (mini-runtime.c:2564)
20 FormFITiOS 0x000bf91a mono_runtime_invoke (object.c:2897)
21 FormFITiOS 0x000e49a6 start_wrapper (threads.c:740)
22 FormFITiOS 0x0011cfa2 inner_start_thread (mono-threads-posix.c:92)
23 libsystem_pthread.dylib 0x21ce985a _pthread_body + 138
24 libsystem_pthread.dylib 0x21ce97ce _pthread_start + 110
25 libsystem_pthread.dylib 0x21ce7724 thread_start + 8

Thread 12 name: tid_660b
Thread 12:
0 libsystem_kernel.dylib 0x21c449c0 __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x21ce8dec _pthread_cond_wait + 536
2 libsystem_pthread.dylib 0x21ce9cd8 pthread_cond_timedwait + 44
3 FormFITiOS 0x001200e2 mono_thread_info_sleep (mono-os-mutex.h:135)
4 FormFITiOS 0x000dd6fe monitor_thread (threadpool-ms.c:887)
5 FormFITiOS 0x000e4944 start_wrapper (threads.c:717)
6 FormFITiOS 0x0011cfa2 inner_start_thread (mono-threads-posix.c:92)
7 libsystem_pthread.dylib 0x21ce985a _pthread_body + 138
8 libsystem_pthread.dylib 0x21ce97ce _pthread_start + 110
9 libsystem_pthread.dylib 0x21ce7724 thread_start + 8

Thread 13 name: tid_690b
Thread 13:
0 libsystem_kernel.dylib 0x21c449c0 __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x21ce8dec _pthread_cond_wait + 536
2 libsystem_pthread.dylib 0x21ce9cd8 pthread_cond_timedwait + 44
3 FormFITiOS 0x000ddf52 worker_thread (mono-os-mutex.h:134)
4 FormFITiOS 0x000e4944 start_wrapper (threads.c:717)
5 FormFITiOS 0x0011cfa2 inner_start_thread (mono-threads-posix.c:92)
6 libsystem_pthread.dylib 0x21ce985a _pthread_body + 138
7 libsystem_pthread.dylib 0x21ce97ce _pthread_start + 110
8 libsystem_pthread.dylib 0x21ce7724 thread_start + 8

Thread 14 name: tid_6c0b
Thread 14:
0 libsystem_kernel.dylib 0x21c449c0 __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x21ce8dec _pthread_cond_wait + 536
2 libsystem_pthread.dylib 0x21ce9cd8 pthread_cond_timedwait + 44
3 FormFITiOS 0x000ddf52 worker_thread (mono-os-mutex.h:134)
4 FormFITiOS 0x000e4944 start_wrapper (threads.c:717)
5 FormFITiOS 0x0011cfa2 inner_start_thread (mono-threads-posix.c:92)
6 libsystem_pthread.dylib 0x21ce985a _pthread_body + 138
7 libsystem_pthread.dylib 0x21ce97ce _pthread_start + 110
8 libsystem_pthread.dylib 0x21ce7724 thread_start + 8

Thread 0 crashed with ARM Thread State (32-bit):
r0: 0x00000000 r1: 0x00000000 r2: 0x00000000 r3: 0x00000000
r4: 0x00000006 r5: 0x38825000 r6: 0xa7fb88d4 r7: 0x02a9bc34
r8: 0x15bd48e0 r9: 0x21ce404d r10: 0x027494d0 r11: 0x15bd4800
ip: 0x00000148 sp: 0x02a9bc28 lr: 0x21cea733 pc: 0x21c44c84
cpsr: 0x00000010

Binary Images:
0x43000 - 0x27e6fff FormFITiOS armv7 <13da86a1a52238849149f95f0e74b899> /var/mobile/Containers/Bundle/Application/9CD57F16-215F-4E4B-B592-FFB56004F396/FormFITiOS.app/FormFITiOS
0x1fe70000 - 0x1fe97fff dyld armv7 /usr/lib/dyld
0x216e4000 - 0x216e5fff libSystem.B.dylib armv7 <48dbf1ef9b8c3b1c96d9b12a5c589d4a> /usr/lib/libSystem.B.dylib
0x216e6000 - 0x21731fff libc++.1.dylib armv7 /usr/lib/libc++.1.dylib
0x21732000 - 0x2174cfff libc++abi.dylib armv7 <0bbfc565b83836e5bd908405cece3367> /usr/lib/libc++abi.dylib

Best Answer

Answers

  • thanks @Gerald. Problem with Login Page xaml only.I am using Custom renderer for Entry control. If i change to default Entry, App is working fine. Do you have any idea why app is getting crashed if use custom renderer. Below is my code:

    CustomRenderer.cs

    [assembly: ExportRenderer (typeof(FFEntry), typeof(FFEntryRenderer))] namespace FormFIT { public class FFEntryRenderer : EntryRenderer { protected override void OnElementChanged (ElementChangedEventArgs<Entry> e) { base.OnElementChanged (e); if (Control != null) { // do whatever you want to the UITextField here! Control.Font = UIFont.FromName("Verdana",12); //Control.BorderStyle = UITextBorderStyle.Line; Control.AutocorrectionType = UITextAutocorrectionType.No; Control.AutocapitalizationType = UITextAutocapitalizationType.None; } } } }

    XAML :

    <?xml version="1.0" encoding="utf-8" ?> <ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:local="clr-namespace:FormFIT;assembly=FormFIT" x:Class="FormFIT.Views.LoginPage"> <StackLayout VerticalOptions="Center" HorizontalOptions="Center" > <StackLayout VerticalOptions="Center" HorizontalOptions="Center" > <Label Text= "{Binding ErrorText}" TextColor="Red" HorizontalOptions="Center" StyleId="ErrorId" FontSize="14"/> </StackLayout> <StackLayout VerticalOptions="Center" HorizontalOptions="Center" Padding="0,10,0,0" x:Name="MainPage"> <local:FFEntry Text= "{Binding Username}" Placeholder="Username" HorizontalOptions="Center" WidthRequest="250" x:Name="Username" StyleId="UsernameId"/> <local:FFEntry Text="{Binding Password}" Placeholder="Password" IsPassword="true" x:Name="Password" StyleId="PasswordId"/> <Button Text="Log In" VerticalOptions="Center" HorizontalOptions="Center" x:Name="LoginBtn" StyleId="LoginBtn"/> </StackLayout> </StackLayout> </ContentPage>

    Please need help on this!!

  • ClintStLaurentClintStLaurent USUniversity ✭✭✭✭✭

    How does that page actually do anything when the Entry text isn't bound to a property on your ViewModel, and the Button doesn't have a command assigned to it?

    Clearly there must be some meaningful code in the C# behind this page/renderer. You might need to focus there. You may need to add a bunch of robust logging.

    App is working fine when installing through debug mode.

    Have you put it on the device directly in RELEASE mode?

    Have you put in robust error handling? What if expected objects are null? What if the specified font doesn't exist on that device? Etc. Most crashes on launch in my experience tend to eventually boil down to a null reference or other unhandled exception that cascades to critical failure. But maybe that's just my experience.

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