Serverless Stack

I’m getting
```No Lambda handlers are found in the app```
when deploying my stack. Could this be caused by my creating an SNS topic that doesn’t have any (function) subscribers, only a SQS topic?

this is my stack definition:
```    const api = new sst.Api(this, "Api", {
      defaultFunctionProps: {
        srcPath: "src",
      },
      routes: {
        "POST /": "sns_publisher/lambda.handler",
      },
    });

    const topic = new sst.Topic(this, "user-events");

    const queue = new sst.Queue(this, "people-data-enrichment", {
      consumer: {
        function: {
          handler: "people_data_enricher/lambda.handler",
          srcPath: "src",
        },
        consumerProps: {
          batchSize: 1,
        },
      },
    });

    topic.snsTopic.addSubscription(new SqsSubscription(queue.sqsQueue));

    this.addOutputs({
      ApiEndpoint: api.url,
    });```