Panic: runtime error: index out of range [0] with length 0

[zohaibakber]

this happens after I use preTokenGen lambda for userPool

 const postConfirmation = new sst.aws.Function("PostConfirmation", {
      handler: "src/server/functions/post-confirm.handler",
      architecture: "arm64",
      runtime: "nodejs20.x",
      link: [DB],
    });
    const preToken = new sst.aws.Function("PreToken", {
      handler: "src/server/functions/pre-token.handler",
      architecture: "arm64",
      runtime: "nodejs20.x",
      link: [DB],
    });
    const userPool = new aws.cognito.UserPool("NubIonUserPool", {
      autoVerifiedAttributes: ["email"],
      passwordPolicy: {
        minimumLength: 8,
      },
      usernameAttributes: ["email"],
      lambdaConfig: {
        postConfirmation: postConfirmation.arn,
        preTokenGeneration: preToken.arn,
      },
    });
    const userPoolClient = new aws.cognito.UserPoolClient(
      "NubIonUserPoolClient",
      {
        userPoolId: userPool.id,
      },
    );```

[zohaibakber]

[zohaibakber]

Turn out you have to do this

 preTokenGenerationConfig: {
          lambdaArn: preToken.arn,
          lambdaVersion: "V1_0",
        },