microsoft/semantic-kernel · error · NotSupportedException

Vector store type '{config.Rag.VectorStoreType}' is not supp

Error message

Vector store type '{config.Rag.VectorStoreType}' is not supported.

What it means

Error "Vector store type '{config.Rag.VectorStoreType}' is not supported." thrown in microsoft/semantic-kernel.

Source

Thrown at dotnet/samples/Demos/AgentFrameworkWithAspire/ChatWithAgent.ApiService/Program.cs:183

        }

        // Add Vector Store
        switch (config.Rag.VectorStoreType)
        {
            case AzureAISearchConfig.ConfigSectionName:
            {
                builder.AddAzureSearchClient(
                    connectionName: AzureAISearchConfig.ConnectionStringName,
                    configureSettings: (settings) => settings.Credential = builder.Environment.IsProduction()
                        ? new DefaultAzureCredential()
                        : new AzureCliCredential()
                );
                builder.Services.AddAzureAISearchCollection<TextSnippet<string>>(config.Rag.CollectionName);
                builder.Services.AddVectorStoreTextSearch<TextSnippet<string>>();
                break;
            }
            default:
                throw new NotSupportedException($"Vector store type '{config.Rag.VectorStoreType}' is not supported.");
        }
    }

    /// <summary>
    /// Adds the chat completion agent to the service collection.
    /// </summary>
    /// <param name="builder">The web application builder.</param>
    /// <param name="config">The host configuration.</param>
    private static void AddAgent(WebApplicationBuilder builder, HostConfig config)
    {
        // Register agent without RAG if no collection name is provided. Allows for a basic experience where no data has been uploaded to the vector store yet.
        if (string.IsNullOrEmpty(config.Rag.CollectionName))
        {
            PromptTemplateConfig templateConfig = KernelFunctionYaml.ToPromptTemplateConfig(EmbeddedResource.Read("AgentDefinition.yaml"));

            builder.Services.AddTransient<ChatCompletionAgent>((sp) =>
            {
                return new ChatCompletionAgent(templateConfig, new HandlebarsPromptTemplateFactory())

View on GitHub (pinned to c028a0c7dc)

Solutions

1. Set Rag:VectorStoreType to one of the supported vector store values in configuration.
2. Check Program.cs for the list of supported vector store types and correct the configuration value.

When it happens

Trigger: Thrown at dotnet/samples/Demos/AgentFrameworkWithAspire/ChatWithAgent.ApiService/Program.cs:183 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/semantic-kernel@c028a0c7dc (2026-08-13). Data as JSON: /api/errors/6de100e8e1fc8d3a. Report an issue: GitHub.