Azure-functions-core-tools: System.Private.CoreLib: Could not load file or assembly 'Microsoft.AspNetCore.Http.Abstractions'

[espray]

C:\Users\erics\AppData\Roaming\npm
-- [email protected] +-- [email protected] |-- [email protected]
| -- [email protected] -- [email protected]
`-- [email protected]

[kulibali]

I am also seeing this when trying to debug a new Functions project from a new install of VS2017 15.5.2.

[baget]

also seeing it now, when trying to debug new function in VS2017 15.5.2
using SDK.Functions 1.0.7
on SDK.Functions 1.0.6 it is working. after upgrading start to fail
you test it using the default sample function that is created by VS2017

[andymac4182]

I am getting the same error in VS2017 15.5.2 It seems related to the fact that the cli loads a certain version of the dll then you try to reference a different version. I am having a similar issue with WindowsAzure.Storage

Seems related to https://github.com/Azure/azure-functions-cli/issues/335 and https://github.com/Azure/azure-functions-cli/issues/253

[evgeny-n]

Same issue for me. Pre-conditions:
C# function,
.Net Standard 2.0,
WindowsAzure.Storage 8.7.0

Could not load assembly WindowsAzure.Storage (or similar). Nothing worked, until I downgraded WindowsAzure.Storage to 8.6.0. This is a version I've seen when NPM was restoring dependencies for Functions SDK. Downgraded, cleaned, re-compiled - voila!

[corsjune]

Also had same issue with WindowsAzure.Storage 9.0 and 8.7. Had to downgrade to 8.6. Thanks for the workaround evgeny-n !

Did not have this issue with Azure functions V1 (.Net Framework). Occurred when I ported to V2 (.Net Standard 2.0)

[jrebagliatti]

Thanks @evgeny-n for your workaround. Updating the Azure Functions and Web Jobs Tools to the latest version might also help.

[jg11jg]

Am getting same error message when running azure functions project locally. Targetting .net standard 2.0.
Using .net sdk functions 1.0.6 and it worked ok initially for the "Function1" freebie function. Then added reference to Microsoft.AspNetCore.Authentication.JwtBearer and immediately get this error.

I also tried installing System.IdentityModel.Tokens.Jwt package [i just want to parse a jwt]. this works in local debugging but fails when I publish it to azure.

Is it just me or is version hell back with a massive vengeance in .net core space - possibly worse than ever before?

[SoulFireMage]

Just for fun, I get it on the actual Azure portal. The code is merely from the Azure samples.

[SoulFireMage]

I've uploaded the correct file to the folder in question, I'm certain it's in the right place as all the other dlls reside in the webRoot. However, it's blatantly giving the same message?

"The function runtime is unable to start. System.Private.CoreLib: Could not load file or assembly 'Microsoft.AspNetCore.Mvc.Abstractions, Version=2.0.3.0"

Is this still my inexperience with the platform (quite plausible, I know) ?

[reddy6ue]

I am getting something similar, but for cosmosdb trigger functions.

System.Private.CoreLib: One or more errors occurred. (Unable to load DLL 'Microsoft.Azure.Documents.ServiceInterop.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)). Microsoft.Azure.DocumentDB.Core: Unable to load DLL 'Microsoft.Azure.Documents.ServiceInterop.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

[Bubeee]

The similar issue for the prerelease version of Azure.KeyVault

Could not load file or assembly 'Microsoft.Azure.KeyVault, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Could not find or load a specific file. (Exception from HRESULT: 0x80131621)

[johnkwaters]

Getting the same thing, after adding Microsoft.AspNetCore.Authentication.JwtBearer. VS 2017 15.7.1. Azure Functions and Web Jobs Tools 15.0.40502.0.

[espray]

Same issue with <PackageReference Include="Microsoft.Extensions.Options" Version="2.0.1" /> down graded to <PackageReference Include="Microsoft.Extensions.Options" Version="2.0.0" /> to resolve the issue

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Hosting environment: Production
Content root path: C:\Users*\netstandard2.0
Now listening on: http://localhost:7071
Application started. Press Ctrl+C to shut down.
[5/14/2018 2:13:05 PM] Reading host configuration file 'C:\Users*\bin\Debug\netstandard2.0\host.json'
[5/14/2018 2:13:05 PM] Host configuration file read:
[5/14/2018 2:13:05 PM] {}
[5/14/2018 2:13:05 PM] Starting Host (HostId=bngdsktp029-1966213432, InstanceId=77f4eb63-255e-4169-83f9-388d1d60fce0, Version=2.0.11651.0, ProcessId=16084, AppDomainId=1, Debug=False, ConsecutiveErrors=0, StartupCount=1, FunctionsExtensionVersion=)
[5/14/2018 2:13:05 PM] Generating 1 job function(s)
[5/14/2018 2:13:06 PM] Found the following functions:
[5/14/2018 2:13:06 PM] ConnectBooster.Host.Synchronization.Functions.GraphQLFunction.RunGraphQL
[5/14/2018 2:13:06 PM]
[5/14/2018 2:13:06 PM] Host initialized (533ms)
[5/14/2018 2:13:06 PM] Host started (731ms)
[5/14/2018 2:13:06 PM] Job host started
[5/14/2018 2:13:06 PM] Host lock lease acquired by instance ID '0000000000000000000000003E437901'.
Listening on http://localhost:7071/
Hit CTRL-C to exit...

Http Functions:

    graphql: http://localhost:7071/api/graphql

[5/14/2018 2:13:09 PM] Executing 'graphql' (Reason='This function was programmatically called via the host APIs.', Id=8a3feaea-8fea-4140-b833-df8c7cac1a43)
[5/14/2018 2:13:09 PM] Executed 'graphql' (Failed, Id=8a3feaea-8fea-4140-b833-df8c7cac1a43)
[5/14/2018 2:13:09 PM] System.Private.CoreLib: Exception while executing function: graphql. graphql-dotnet-builder: Could not load file or assembly 'Microsoft.Extensions.Options, Version=2.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. Could not find or load a specific file. (Exception from HRESULT: 0x80131621). System.Private.CoreLib: Could not load file or assembly 'Microsoft.Extensions.Options, Version=2.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
`

[apostrophe]

Updating "Azure Functions and Web Jobs Tools" extension fixed the issue for me, although I am only trying to get it to run locally.

Steps:
In Visual Studio
Go to Tools > Extensions and Updates
In Extensions and Updates dialog, expand Updates > Visual Studio Marketplace
Choose Azure Functions and Web Jobs Tools
Select Update
Restart VS

[johnwc]

@apostrophe , fixed what exactly? I have the latest and greatest of what's in the "Extensions and Updates" and I still see this when trying to use anything above EF Core 2.0

I have 15.0.40502.0 installed of "Azure Functions and Web Jobs Tools"

[apostrophe]

I have 15.0.40502.0 installed of "Azure Functions and Web Jobs Tools"

That's the same version I am have, but I'm not using EF Core.

[johnkwaters]

I was able to get further by downgrading some of the nuget references to be the same as used by the tools, but only got so far down that path. Not able to reference EF Core without getting similar errors.

[daviburg]

Had this issue, got the updates (VS extension then Nuget then CLI tool then Storage emulator), issue stopped and function was working. Re-opened the project later in the evening, issue is back. No further update possible this time. Puzzling...

[espray]

I have not had this issue for some time now. Currently running on v36 all nugets on latested(EF, AzStorage and AzEventHub).
Using VS 2017 as well.

@daviburg
Double check the host version. Maybe the AzHost is npm installed global????

[maiqbal11]

A significant number of changes relating to Functions V2 GA have happened since this issue was originally opened and the underlying issue has been addressed. Anyone who is still experiencing issues should feel free to open separate issues.