Exception while saving to Raven

I'm getting an exception while trying to save an entity to Raven in one of our environments.

Here are details:

Application Target Framework: .NET Core 2.1

RavenDB.Client Version: 4.1.2

.Net Core Runtime and Hosting Bundle installed on the server:

2.0.5

2.1.3

2.1.6

2.2.0

(We have multiple versions installed since it is a shared environment with multiple applications hosted)

Exception:

System.IO.FileLoadException: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
File name: 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
   at Sparrow.Json.UnmanagedWriteBuffer.Write(Byte* buffer, Int32 count)
   at Sparrow.Json.BlittableWriter`1.WriteValue(Byte* buffer, Int32 size, FastList`1 escapePositions, BlittableJsonToken& token, UsageMode mode, Nullable`1 initialCompressedSize) in C:\Builds\RavenDB-Stable-4.1\src\Sparrow\Json\BlittableWriter.cs:line 555
   at Sparrow.Json.BlittableJsonDocumentBuilder.ReadInternal[TWriteStrategy]() in C:\Builds\RavenDB-Stable-4.1\src\Sparrow\Json\BlittableJsonDocumentBuilder.cs:line 320
   at Sparrow.Json.JsonOperationContext.ReadObjectInternal(Object builder, String documentId, UsageMode mode, IBlittableDocumentModifier modifier) in C:\Builds\RavenDB-Stable-4.1\src\Sparrow\Json\JsonOperationContext.cs:line 619
   at Raven.Client.Documents.Session.InMemoryDocumentSessionOperations.StoreEntityInUnitOfWork(String id, Object entity, String changeVector, DynamicJsonValue metadata, ConcurrencyCheckMode forceConcurrencyCheck) in C:\Builds\RavenDB-Stable-4.1\src\Raven.Client\Documents\Session\InMemoryDocumentSessionOperations.cs:line 741
   at Raven.Client.Documents.Session.InMemoryDocumentSessionOperations.StoreInternal(Object entity, String changeVector, String id, ConcurrencyCheckMode forceConcurrencyCheck) in C:\Builds\RavenDB-Stable-4.1\src\Raven.Client\Documents\Session\InMemoryDocumentSessionOperations.cs:line 673
   at Raven.Client.Documents.Session.InMemoryDocumentSessionOperations.StoreAsyncInternal(Object entity, String changeVector, String id, ConcurrencyCheckMode forceConcurrencyCheck, CancellationToken token) in C:\Builds\RavenDB-Stable-4.1\src\Raven.Client\Documents\Session\InMemoryDocumentSessionOperations.cs:line 703
   <Project Specific StackTrace>
   at lambda_method(Closure , Object )
   at Microsoft.Extensions.Internal.ObjectMethodExecutorAwaitable.Awaiter.GetResult()
   at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextExceptionFilterAsync()

Interestingly the application works perfectly fine in one of the very similar machine with identical set up and same set of framework installed. I'm not sure what is causing this Raven to fail. Any pointers is highly appreciated.

Looks like System.Runtime.CompilerServices.Unsafe is not installed correctly.

Try:

1. Installing and using the latest RavenDB client package -OR-

2. Try to manually install from https://www.nuget.org/packages/System.Runtime.CompilerServices.Unsafe/

Install-Package System.Runtime.CompilerServices.Unsafe -Version 4.5.2