What does this mean and how to fix it: Xamarin.iOS: Unable to locate assembly 'Xamarin.Forms.Platform.iOS' (culture: '')

Question

I noticed the following in the build output:

2021-05-27 08:35:57.088 Xamarin.PreBuilt.iOS[674:187068] Xamarin.iOS: Unable to locate assembly 'Xamarin.Forms.Platform.iOS' (culture: '')
2021-05-27 08:35:57.089 Xamarin.PreBuilt.iOS[674:187068] Xamarin.iOS: Unable to locate assembly 'Xamarin.Forms.Core' (culture: '')
2021-05-27 08:35:57.302 Xamarin.PreBuilt.iOS[674:187068] Xamarin.iOS: Unable to locate assembly 'Microsoft.Bcl.AsyncInterfaces' (culture: '')
2021-05-27 08:35:57.342 Xamarin.PreBuilt.iOS[674:187068] Xamarin.iOS: Unable to locate assembly 'Microsoft.Azure.Storage.Common' (culture: '')

and many more similar to these.
The messages point to an issue with stuff that is not my code. How can I fix this? Do I need to fix it?
Thanks!

Answer 1

I have this issue too. Couple of weeks ago the project was working fine. For some reason I need to pause it. Then two weeks later when reopen, it fails when run on a physical iOS device

Already clean the project, rebuild, close VS, and still the problem

The only thing that changes on my pc was the KB5007262 and KB5007292

I'm using VS 2022 Community 17.0.1
.Net is 4.8.04161
Windows 11 22000.348
iOS is 15.0.2 - iPhone

Edit:

Uninstalling those KB and still the same. This is the log

=================================================================

Native Crash Reporting

Got a segv while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries

used by your application.

=================================================================

Native stacktrace:

0x1025c41e0 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : mono_dump_native_crash_info

0x1025bac5c - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : mono_handle_native_crash

0x1025c7bb8 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : mono_sigsegv_signal_handler_debug
0x1ddcd7d50 - /usr/lib/system/libsystem_platform.dylib : <redacted>

0x185a44170 - /System/Library/Frameworks/Foundation.framework/Foundation : <redacted>

0x102769c34 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : do_icall

0x1027682c4 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : do_icall_wrapper

0x10275f1b8 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : interp_exec_method_full

0x10275d748 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : interp_runtime_invoke

0x1025cae70 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : mono_jit_runtime_invoke

0x102679188 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : mono_runtime_try_invoke
0x1026b3948 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : worker_callback

0x1026b11bc - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : worker_thread

0x1026bc144 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : start_wrapper_internal
0x1026bbfc8 - /private/var/containers/Bundle/Application/_SOME_GUID_/MyApp.iOS.app/Xamarin.PreBuilt.iOS : start_wrapper
0x1ddce4458 - /usr/lib/system/libsystem_pthread.dylib : _pthread_start

0x1ddce2ab0 - /usr/lib/system/libsystem_pthread.dylib : thread_start

Managed Stacktrace:

  at <unknown> <0xffffffff>
  at ObjCRuntime.Messaging:void_objc_msgSend_IntPtr_UIntPtr <0x00022>
  at Foundation.NSMutableData:AppendBytes <0x00054>
  at Foundation.NSData:FromStream <0x0010c>
  at <LoadImageAsync>d__1:MoveNext <0x00166>
  at MoveNextRunner:InvokeMoveNext <0x00012>
  at <Module>:invoke_void_object <0x0009e>
  at System.Threading.ExecutionContext:RunInternal <0x00134>
  at System.Threading.ExecutionContext:Run <0x00016>
  at MoveNextRunner:Run <0x00058>
  at <Module>:invoke_void <0x00078>
  at System.Threading.Tasks.AwaitTaskContinuation:System.Threa

ding.IThreadPoolWorkItem.ExecuteWorkItem <0x00020>
at System.Threading.ThreadPoolWorkQueue:Dispatch <0x0014c>
at System.Func1:invoke_TResult <0x00096> at ObjCRuntime.Runtime:ThreadPoolDispatcher <0x0001e> at System.Func2:invoke_TResult_T <0x0009e>
at System.Threading._ThreadPoolWaitCallback:PerformWaitCallback <0x00038>
at <Module>:runtime_invoke_direct_bool <0x00036>

Answer 2

When I removed Xamarin.Forms.Visual.Material in the ios project, it worked.

Answer 3

An upgrade to VS fixed this at some point... dont remember which version... upgrade to latest and it should work for you.

Answer 4

same issue.. :(

Answer 5

I'm noticing the same issue and not able run the app on physical devices. I do notice that the SDK version isn't in the dropdown?