ScriptHost fails to start with error cannot find : 'Microsoft.AspNetCore.Mvc.Abstractions, Version=2.0.1.0'

[pragnagopa]

Customer reported issue on SO

Reproes with latest version Microsoft.NET.Sdk.Functions 1.0.10

Error:
[3/21/2018 9:59:48 PM] ScriptHost initialization failed
[3/21/2018 9:59:48 PM] System.Private.CoreLib: Could not load file or assembly 'Microsoft.AspNetCore.Mvc.Abstractions, 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.AspNetCore.Mvc.Abstractions, Version=2.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

[pragnagopa]

@ahmelsayed - This reproes with 1.0.9 and 1.0.10

[ahmelsayed]

Can you check what runtime version they have?

[pragnagopa]

@soninaren looked into this. VS tooling regressed as it is downloading older version of CLI: 2.0.1-beta instead of 2.0.1-beta-22.
@soninaren will follow up VS team.

[mdekrey]

Is there a workaround for this to run from Visual Studio? For example, can we manually upgrade the CLI in the meantime?

I was able to install and run from command line, following the instructions for the CLI, but it's definitely not ideal as it didn't help in Visual Studio.

[soninaren]

This has been fixed. Please update the functions extension from Tools -> Extensions -> Updates -> Azure Functions and Web Jobs Tools. The version you are looking for is 15.0.40322.0

[soninaren]

Please re-open if this still doesn't work for you.

[chriswill]

I was the original poster on SO, and I just tried this with the 1.0.11 version of Microsoft.Net.Sdk.Functions and version 15.0.40322.0 of Azure Functions and Web Tools. Still get the error.

The error I receive is:
[3/27/2018 10:09:21 PM] ScriptHost initialization failed [3/27/2018 10:09:21 PM] System.Private.CoreLib: Could not load file or assembly 'Microsoft.Extensions.Logging.Abstractions, 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.Logging.Abstractions, Version=2.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

which is somewhat different from what @pragnagopa reported above.

You can see a Github example which shows the error here: https://github.com/chriswill/FunctionDemo.

Version 15.0.40322.0 shows that it was released on March 14. Is that the correct version?

cc: @soninaren

[soninaren]

Can you delete the contents of this folder "C:\Users<user>\AppData\Local\Azure.Functions.V2.Cli", rebuild and press F5 to run

[chriswill]

I did that, re-ran the project and noted that a 2.0.1-beta.22 folder was re-created in the directory.

Unfortunately no change. Still see the error.

[soninaren]

You need Version:2.0.0 for Microsoft.Extensions.Logging and related packages. Sent a PR showing the fix.

https://github.com/chriswill/FunctionDemo/pull/1

[soninaren]

@chriswill please re-open if the fix did not work for you.

[chriswill]

Thanks @soninaren that did work for me. I'm surprised that I won't be able to keep my app updated with current versions, but perhaps when a new version of the functions sdk comes out?

[ede0m]

@soninaren are you able to publish the above fix publicly? I am having the same issue with version 15.0.40322.0 running locally.

[OmerRasheed]

I am having below issue. I have already installed the specified version but issue not resolved. Please help rectify the issue.

[3/6/2019 6:06:32 AM] Host configuration file read:
[3/6/2019 6:06:32 AM] {}
[3/6/2019 6:06:32 AM] Starting Host (HostId=omerrasheed-686540239, InstanceId=b6d47b71-f91b-4e8e-86ab-ec101eaa47a0, Version=2.0.11651.0, ProcessId=14792, AppDomainId=1, Debug=False, ConsecutiveErrors=0, StartupCount=1, FunctionsExtensionVersion=)
[3/6/2019 6:06:33 AM] A ScriptHost error has occurred
[3/6/2019 6:06:33 AM] System.Private.CoreLib: Could not load file or assembly 'Microsoft.AspNetCore.Mvc.Abstractions, Version=2.1.0.0, 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.AspNetCore.Mvc.Abstractions, Version=2.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.