Skill builder CDK problem

Question

While following the tutorial,

To start the dead-letter queue threshold test, in the test directory, create a new file named dead-letter-queue.test.ts with the following code, then save the file:
```
import { SynthUtils } from '@aws-cdk/assert';
import { Stack } from '@aws-cdk/core';

import dlq = require('../lib/dead-letter-queue');

test('dlq creates an alarm', () => {
  const stack = new Stack();
  new dlq.DeadLetterQueue(stack, 'DLQ');
  expect(SynthUtils.toCloudFormation(stack)).toMatchSnapshot();
});
```
a redline under stack appears in my vs editor:

```
Argument of type 'import("/Users/kick7spring/Documents/Log/maven/TestingConstructs/node_modules/@aws-cdk/core/lib/stack").Stack' is not assignable to parameter of type 'import("/Users/kick7spring/Documents/Log/maven/TestingConstructs/node_modules/aws-cdk-lib/core/lib/stack").Stack'.
  Type 'Stack' is missing the following properties from type 'Stack': _crossRegionReferences, _suppressTemplateIndentation, _terminationProtection, permissionsBoundaryArn, and 7 more
```
I am new to this, and I do not know how to resolve this.

this is my package.json
 
```
{
  "name": "testing_constructs",
  "version": "0.1.0",
  "bin": {
    "testing_constructs": "bin/testing_constructs.js"
  },
  "scripts": {
    "build": "tsc",
    "watch": "tsc -w",
    "test": "jest",
    "cdk": "cdk"
  },
  "devDependencies": {
    "@aws-cdk/assertions": "1.203.0",
    "@types/babel__traverse": "7.18.2",
    "@types/jest": "^27.5.0",
    "@types/node": "10.17.27",
    "@types/prettier": "2.6.0",
    "aws-cdk": "1.203.0",
    "jest": "^27.5.1",
    "ts-jest": "^27.1.4",
    "ts-node": "^10.8.1",
    "typescript": "~3.9.7"
  },
  "dependencies": {
    "@aws-cdk/assert": "^2.68.0",
    "@aws-cdk/aws-cloudwatch": "^1.20.0",
    "@aws-cdk/aws-sqs": "^1.204.0",
    "@aws-cdk/core": "1.204.0",
    "source-map-support": "^0.5.21"
  }
}

```

thanks

Answer

Hello.

The version of CDK you are using may not match the version specified in package.json.  
You can check the version with the command below.  
```
cdk --version
```

For CDK version 2, I think you need to use package.json as described in the document below.  
https://docs.aws.amazon.com/cdk/v2/guide/manage-dependencies.html

You can migrate to version 2 by following the steps in the document below.  
https://docs.aws.amazon.com/cdk/v2/guide/migrating-v2.html

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