Azure Functions Core Tools failing to install extensions required for bindings

Question

I am attempting to run an Azure Function (JavaScript) locally, but it's failing upon func start with the following error.

AddConfig: The binding type(s) 'table' are not registered. Please ensure the type is correct and the binding extension is installed.

Please note that I have successfully installed the prerequisites, which at the time or writing were .NET Core 2.1, Node.JS and the Core Tools package.

As is obvious from the error above, I've added an output binding for a Table to function.json for a function called 'AddConfig'. I added the binding as per the documentation.

Is anyone able to advise on what I may be missing here?

Things I've tried

Following the documentation

I ran the following command in the project folder, as per the documentation.

func extensions install

This produced the following output -

Microsoft (R) Build Engine version 15.9.20+g88f5fadfbe for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restoring packages for C:\super-secret-path\WitchHunt\AddConfig\extensions.csproj...
  Generating MSBuild file C:\super-secret-path\WitchHunt\AddConfig\obj\extensions.csproj.nuget.g.props.
  Generating MSBuild file C:\super-secret-path\WitchHunt\AddConfig\obj\extensions.csproj.nuget.g.targets.
  Restore completed in 314.99 ms for C:\super-secret-path\WitchHunt\AddConfig\extensions.csproj.
  extensions -> C:\super-secret-path\WitchHunt\AddConfig\bin\extensions.dll

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:01.66

The command also resulted in extensions.csproj being added to the project with the following content -

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <WarningsAsErrors></WarningsAsErrors>
    <DefaultItemExcludes>**</DefaultItemExcludes>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator" Version="1.0.1" />
  </ItemGroup>
</Project>

Targeting the required extension

I have tried to install the extension manually using the following command. While this action worked and resulted in the package reference being added to extensions.csproj, rerunning the function results in the same error.

func extensions install --package Microsoft.Azure.WebJobs.Extensions.Storage --version 3.0.3

Creating a binding on the Portal and copying 'extensions.csproj'

The title says it all really. I created a Function App, added a function, created a binding, installed the extension and then copied/pasted extensions.csproj, but the error still persists.

My function.json, in case anyone is interested

The httpTrigger and http bindings are those which were generated when I created the function, while the table binding was copied from the documentation (I've then altered the tableName and connection properties, but I don't think that's the issue).

{
    "disabled": false,
    "bindings": [
        {
            "authLevel": "function",
            "type": "httpTrigger",
            "direction": "in",
            "name": "req",
            "methods": [
                "get",
                "post"
            ]
        },
        {
            "type": "http",
            "direction": "out",
            "name": "res"
        },
        {
            "tableName": "WitchHuntConfig",
            "connection": "AzureWebJobsStorage",
            "name": "tableBinding",
            "type": "table",
            "direction": "out"
        }
    ]
}

Answer 1

func extensions install --package Microsoft.Azure.WebJobs.Extensions.Storage --version 3.0.3 should fix, try to delete bin obj folder then run this command again.

func extensions install is not useless, the point is that binding type table is not in the BindingPackageMap hence the extension is not installed. Have open an issue to track.