CDK - Error: unable to determine cloud assembly asset output directory. Assets must be defined indirectly within a "Stage" or an "App" scope

Cause:

Got this error after executing 

1) `npm install @aws-cdk/aws-lambda`

2) `cdk diff` --> threw error

This is because of the version mismatch of @aws-cdk/aws-lambda package against @aws-cdk/core.

The package.json file looked like this:

"dependencies": {

    "@aws-cdk/aws-lambda": "^1.78.0",

    "@aws-cdk/aws-sns": "1.49.1",

    "@aws-cdk/aws-sns-subscriptions": "1.49.1",

    "@aws-cdk/aws-sqs": "1.49.1",

    "@aws-cdk/core": "1.49.1"

  }

Fix:

Updated the package.json file as follows:

"dependencies": {

    "@aws-cdk/aws-lambda": "1.49.1", --> changed here

    "@aws-cdk/aws-sns": "1.49.1",

    "@aws-cdk/aws-sns-subscriptions": "1.49.1",

    "@aws-cdk/aws-sqs": "1.49.1",

    "@aws-cdk/core": "1.49.1"

  }

And then running `npm i` fixed the issue.

From next time on, install packages with specific version.

`npm install @aws-cdk/aws-apigateway@1.49.1`.

This will update the package.json file as follows:

"dependencies": {

    "@aws-cdk/aws-apigateway": "^1.49.1",

    "@aws-cdk/aws-lambda": "1.49.1",

    "@aws-cdk/aws-sns": "1.49.1",

    "@aws-cdk/aws-sns-subscriptions": "1.49.1",

    "@aws-cdk/aws-sqs": "1.49.1",

    "@aws-cdk/core": "1.49.1"

  }