ModuleNotFoundError: No module named 'aws_cdk'

[ema-]

The following step:

..... runs-on: ubuntu-18.04  (Same for ubuntu-latest)
....

      - name: cdk diff
        uses: youyo/aws-cdk-github-actions@v2
        with:
          cdk_subcommand: 'diff'
          cdk_stack: 'MyStack'
          actions_comment: true
          working_dir: 'cdk'
          debug_log: true
          cdk_version: '1.135' (same result for latest)
        env:
          AWS_ACCESS_KEY_ID: ${{ secrets.ORG_AWS_ACCESS_KEY_ID }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.ORG_AWS_SECRET_ACCESS_KEY }}
          AWS_DEFAULT_REGION: ${{ env.region }}

Fails with:

Run youyo/aws-cdk-github-actions@v2
/usr/bin/docker run --name b31f4027516b598475bb9a49f3fd93[20](https://github.com/perusetechnology/lambda-ocr-and-postprocess/runs/6219902057?check_suite_focus=true#step:8:20)17c_05ebfc --label 294b31 --workdir /github/workspace --rm -e env -e GITHUB_REPOSITORY -e GITHUB_SHA -e region -e accountId -e AWS_DEFAULT_REGION -e AWS_REGION -e AWS_ACCESS_KEY_ID -e AWS_SECRET_ACCESS_KEY -e AWS_SESSION_TOKEN -e INPUT_CDK_SUBCOMMAND -e INPUT_CDK_STACK -e INPUT_ACTIONS_COMMENT -e INPUT_WORKING_DIR -e INPUT_DEBUG_LOG -e INPUT_CDK_VERSION -e INPUT_CDK_ARGS -e HOME -e GITHUB_JOB -e GITHUB_REF -e GITHUB_REPOSITORY_OWNER -e GITHUB_RUN_ID -e GITHUB_RUN_NUMBER -e GITHUB_RETENTION_DAYS -e GITHUB_RUN_ATTEMPT -e GITHUB_ACTOR -e GITHUB_WORKFLOW -e GITHUB_HEAD_REF -e GITHUB_BASE_REF -e GITHUB_EVENT_NAME -e GITHUB_SERVER_URL -e GITHUB_API_URL -e GITHUB_GRAPHQL_URL -e GITHUB_REF_NAME -e GITHUB_REF_PROTECTED -e GITHUB_REF_TYPE -e GITHUB_WORKSPACE -e GITHUB_ACTION -e GITHUB_EVENT_PATH -e GITHUB_ACTION_REPOSITORY -e GITHUB_ACTION_REF -e GITHUB_PATH -e GITHUB_ENV -e GITHUB_STEP_SUMMARY -e RUNNER_OS -e RUNNER_ARCH -e RUNNER_NAME -e RUNNER_TOOL_CACHE -e RUNNER_TEMP -e RUNNER_WORKSPACE -e ACTIONS_RUNTIME_URL -e ACTIONS_RUNTIME_TOKEN -e ACTIONS_CACHE_URL -e GITHUB_ACTIONS=true -e CI=true -v "/var/run/docker.sock":"/var/run/docker.sock" -v "/home/runner/work/_temp/_github_home":"/github/home" -v "/home/runner/work/_temp/_github_workflow":"/github/workflow" -v "/home/runner/work/_temp/_runner_file_commands":"/github/file_commands" -v "/home/runner/work/lambda-ocr-and-postprocess/lambda-ocr-and-postprocess":"/github/workspace" 294b31:f4027516b598475bb9a49f3fd932017c
npm WARN saveError ENOENT: no such file or directory, open '/github/workspace/cdk/package.json'
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN enoent ENOENT: no such file or directory, open '/github/workspace/cdk/package.json'
npm WARN cdk No description
npm WARN cdk No repository field.
npm WARN cdk No README data
npm WARN cdk No license field.

+ [email protected]
added 1 package from 1 contributor and audited 1 package in 1.937s
found 0 vulnerabilities

Install aws-cdk latest
/usr/bin/cdk -> /usr/lib/node_modules/aws-cdk/bin/cdk
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/aws-cdk/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

+ aws-cdk@2.[22](https://github.com/perusetechnology/lambda-ocr-and-postprocess/runs/6219902057?check_suite_focus=true#step:8:22).0
added 1 package from 1 contributor in 1.913s
Successful install aws-cdk latest
Run cdk diff  "MyStack"
Traceback (most recent call last):
  File "app.py", line 8, in <module>
    from aws_cdk import aws_ec2 as ec2
ModuleNotFoundError: No module named 'aws_cdk'

Subprocess exited with error 1
CDK subcommand diff for stack MyStack has failed. See above console output for more details.

[simonloach]

Does anyone know what the cause for that issue might be?