Debug startup fails "no Function runtime available"

[zpittmansf]

Investigative information

Please provide the following:

• Timestamp:
• Function App version (1.0 or 2.0): 3.0
  Visual Studio 2019 16.3.6

Repro steps

Provide the steps required to reproduce the problem:

Start project in debug mode locally.
Immediately a Microsoft Visual Studio Error appears - "There is no Functions runtime available that matches the version specified in the project."

Here is the csproj properties, as far as I know this has not changed since it was working last.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <AzureFunctionsVersion>v3-preview</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.0.0" />
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Kafka" Version="1.0.0-alpha" />
    <PackageReference Include="Microsoft.Extensions.Http" Version="3.0.0" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.30-beta2" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
</Project>

Expected behavior

It builds fine, it should startup at least.

Actual behavior

Fails to startup or even enter the azure function prompt.

Known workarounds

None

Related information

Provide any related information

• Programming language used - C#
• Links to source - N/A simple project on local

[zpittmansf]

Ok it definitely has to do with this line:
<AzureFunctionsVersion>v3-preview</AzureFunctionsVersion>

If I switch that to v2 it will at least start up but will fail to recognize the functions. func.exe actually executes.

[michaeldaw]

I'm also having this issue. I went through the steps detailed here, but I don't see Azure Functions v3 Preview in the list of available templates:

I tried running a function app that was created in the v3-preview on another machine, where it worked as expected, but I get the error mentioned by @zpittmansf on my current machine. It seems like it can't find the v3 preview template(s).

[zpittmansf]

@michaeldaw I just tried to create a fresh project and even though yesterday it worked today I have the same result.

I double checked that the environment variable is in place as well.

[michaeldaw]

Actually, I could have sworn it was working yesterday as well. Maybe something has changed?

[zpittmansf]

Latest commit was 7 days ago on the master branch, I don't see any releases in github that match beta version listed here, not sure why?
Azure/azure-functions-vs-build-sdk@ca38d6b

[michaeldaw]

It seems that the entry for v3-preview in the C:\Users\[user]\AppData\Local\AzureFunctionsTools\feed.json file is automatically deleted when you start visual studio and try to make a new function project.

[zpittmansf]

I can confirm that is the same for me. @michaeldaw how did you figure that one out?

[zpittmansf]

Azure/azure-functions-tooling-feed@ddc1e19 just changed yesterday

[zpittmansf]

@michaeldaw if you want to still run and debug I was able to get this started by opening cmd/powershell to the root of my project then running func.exe start:
C:\temp\projectroot\> C:\Users\[user]\AppData\Local\AzureFunctionsTools\Releases\3.0.2\cli\func.exe start

or you can add a new debug profile that runs the executable:

[a-vishar]

Followed these instructions, unable to see any V3 options in the dropdown and when I try to run an existing project with a manual upgrade I get the "There is no Functions runtime available that matches the version specified in the project." error.

[michaeldaw]

@zpittmansf very nice, thanks for the tip. Hopefully this gets sorted out soon.

[mhoeger]

@soninaren - could you comment on this issue?
cc: @brettsam