Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1

[jrockfl]

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I have created an Azure Function App with .NET Framework 4.71 and I'm receiving the following exception.

Microsoft.Azure.WebJobs.Host.FunctionInvocationException : Exception while executing function: Function1 ---> System.IO.FileNotFoundException : Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.\r\n at System.MemoryExtensions.AsSpan(String text)

var resourceIdentifier = new ResourceIdentifier("/subscriptions/00000000-0000-0000-0000-000000000000");

I have also set this up in a Console App .NET Framework 4.7.1 without any issues.

What can I do to resolve this issue?

[jsquire]

Thank you for your feedback. Tagging and routing to the team member best able to assist.

[ArthurMa1978]

Thank you for reaching us, @archerzz please check if this is the mgmt issue.

[archerzz]

@jrockfl ResourceIdentifiter is from Azure.Core, did you add it in your project dependency?

[jrockfl]

Yes, I added Azure.Core. It was in the nuget package. Loading Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1 is something different.

I was able to get this to work with a console app but not Azure Function.

-----Original Message----- From: "Mingzhe Huang" @.> Sent: Wednesday, March 2, 2022 2:25am To: "Azure/azure-sdk-for-net" @.> Cc: "jrockfl" @.>, "Mention" @.> Subject: Re: [Azure/azure-sdk-for-net] Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1 (Issue #26987)

@jrockfl ResourceIdentifiter is from Azure.Core, did you add it in your project dependency? — Reply to this email directly, view it on GitHub , or unsubscribe . Triage notifications on the go with GitHub Mobile for iOS or Android . You are receiving this because you were mentioned.Message ID: @.***>

[DomCotton]

Hi, I have exactly the same issue after migrating from Microsoft.Azure.ServiceBus to Azure.Messaging.ServiceBus. When I run my solution locally, it executes. However deploying the solution onto a Windows Server 2019 it fails with the following:

Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) at System.Threading.Tasks.ValueTask`1.get_IsCompleted() at Azure.Messaging.ServiceBus.Amqp.AmqpReceiver.<ReceiveMessagesAsync>d__36.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Azure.Messaging.ServiceBus.ServiceBusReceiver.<ReceiveMessagesAsync>d__39.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Azure.Messaging.ServiceBus.ReceiverManager.<ReceiveAndProcessMessagesAsync>d__13.MoveNext()

Not sure if its related or helps resolve...

Thanks

[jfeller403]

I had this exact error message when I tried to use Azure in my project. I searched for the .dll on my computer and found the correct version. Added it to the GAC using gacutil -i . Seemed to solve that issue but then it threw the same error with a new assembly name.

[archerzz]

@jrockfl @DomCotton @jfeller403 This should be a binding redirect problem. Try to explicitly upgrade Unsafe to latest version, or try binding redirect as indicated here.

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