TimeTrigger Exception "Could not create BlobContainerClient for ScheduleMonitor."

Question

When I run my azure function with TimeTrigger I have this error: Microsoft.Azure.WebJobs.Extensions.Timers.Storage: Could not create BlobContainerClient for ScheduleMonitor.

I use a host builder:

public static async Task Main()
        {
            var host = CreateHostBuilder().Build();

            using (host)
            {
                await host.RunAsync();
            }

        static IHostBuilder CreateHostBuilder() => new HostBuilder()
            .UseServiceProviderFactory(new AutofacServiceProviderFactory())
            .ConfigureFunctionsWorkerDefaults()
            .ConfigureHostConfiguration(configHost =>
            {
                configHost.SetBasePath(Directory.GetCurrentDirectory());
                configHost.AddJsonFile("host.json", optional: true);
                configHost.AddEnvironmentVariables();
            })
            .ConfigureAppConfiguration((hostContext, configApp) =>
            {
                var env = hostContext.HostingEnvironment;
                configApp.AddJsonFile("appsettings.json", optional: true);
                configApp.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);
                configApp.AddEnvironmentVariables();
                configApp.AddApplicationInsightsSettings(developerMode: !env.IsProduction());
            })
            .ConfigureServices((hostContext, services) =>
            {
               [...]
            })
            .ConfigureContainer<ContainerBuilder>(builder =>
            {
                builder.RegisterModule<MessagerModule>();
            })
            .ConfigureLogging((hostContext, configLogging) =>
            {
                if (hostContext.HostingEnvironment.IsDevelopment())
                {
                    configLogging.AddConsole();
                    configLogging.AddDebug();
                }
            })
            .UseConsoleLifetime();

and here is the function:

[Function("QueueMessage")]
        public async Task QueueMessageAsync(
            [TimerTrigger("%MessageQueuerOccurence%", RunOnStartup = true)] TimerInfo timer
        )
        {
           [...]
        }

csproj:

<PropertyGroup>
        <TargetFramework>net6.0</TargetFramework>
        <AzureFunctionsVersion>v4</AzureFunctionsVersion>
        <OutputType>Exe</OutputType>
    </PropertyGroup>

    <ItemGroup>
        <Content Include="**\*.json" Exclude="bin\**\*;obj\**\*" CopyToOutputDirectory="Always" />
    </ItemGroup>
    
    <ItemGroup>
        <PackageReference Include="Autofac.Extensions.DependencyInjection" Version="7.2.0" />
        <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.20.0" />
        <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.0.13" />
        <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Timer" Version="4.1.0" />
        <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Storage" Version="5.0.0" />
        <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.3.0" OutputItemType="Analyzer" />
        <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.6.0" />
        <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="6.0.0" />
        <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="6.0.0" />
    </ItemGroup>

local.settings.json:

{ "IsEncrypted": false, "Values": { "AzureWebJobsStorage": "UseDevelopmentStorage=true", "MessageQueuerOccurence": "0 */15 * * * *", "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated" } }

What did I miss?

note: link to Github : https://github.com/Azure/azure-functions-dotnet-worker/issues/779

Answer 1

I was having this issue because I didn't have the storage emulator running...

It worked once I installed and ran azurite, which is the storage emulator that is being maintained (Azure Storage Emulator has been discontinued). You can find more information here on how to install it and use it.

I am using VS Code on a Mac OS, and I found the simplest solution to install azurite extension on VS Code. After the installation, I just had to edit the extension settings, in order to set the location setting (any folder should work). After that I was able to start azurite by running the Azurite: Start from the VS Code command palette.

---

As per the comments, it might also be necessary to edit the local.settings.json file and change the AzureWebJobsStorage value to UseDevelopmentStorage=true.

Answer 2

Im using .net7 (Azure.Functions.Worker)

Inside your local.settings.json file make sure to specify the key 'AzureWebJobsStorage'

{
    "IsEncrypted": false,
    "Values": {
        "AzureWebJobsStorage": "UseDevelopmentStorage=true",
        "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"
    }
}